a)
x+7= -3
x=-3-7
x=-10
spr:
-10+7=-3
-3=-3
b)
0,5x-3= -5
0,5x=-5+3
0,5x=-2
x=-4
0,5*(-4)-3=-5
-2-3=-5
-5=-5
c)
6x-1= -7x-14
6x+7x=-14+1
13x=-13
x=-1
6*(-1)-1=-7*(-1)-14
-6-1=7-14
-7=-7
d)
3x+ (x+75)= 183-5x
3x+x+5x=183-75
9x=108
x=12
3*12+(12+75)=183-5*12
36+87=183-60
123=123
e)
2(x-1) - 3(x+1)= -8
2x-2-3x-3=-8
2x-3x=-8+2+3
-x=-3
x=3
2(3-1)-3(3+1)=-8
2*2-3*4=-8
4-12=-8
-8=-8
f)
4(x+6)-8=2(x+6)
4x+24-8=2x+12
4x-2x=12-24+8
2x=-4
x=-2
4(-2+6)-8=2(-2+6)
4*4-8=2*4
16-8=8
8=8
g)
-3(x-2)-5=3(x+5)+4
-3x+6-5=3x+15+4
-3x-3x=15+4-6+5
0≠18
h)
x-1+2(x-2) + 3(x-3)= 4(x-2)
x-1+2x-4+3x-9=4x-8
x+2x+3x-4x=-8+1+4+9
2x=6
3-1+2(3-2)+3(3-3)=4(3-2)
3-1+2*1+3*0=4*1
3-1+2+0=4
4=4
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a)
x+7= -3
x=-3-7
x=-10
spr:
-10+7=-3
-3=-3
b)
0,5x-3= -5
0,5x=-5+3
0,5x=-2
x=-4
spr:
0,5*(-4)-3=-5
-2-3=-5
-5=-5
c)
6x-1= -7x-14
6x+7x=-14+1
13x=-13
x=-1
spr:
6*(-1)-1=-7*(-1)-14
-6-1=7-14
-7=-7
d)
3x+ (x+75)= 183-5x
3x+x+5x=183-75
9x=108
x=12
spr:
3*12+(12+75)=183-5*12
36+87=183-60
123=123
e)
2(x-1) - 3(x+1)= -8
2x-2-3x-3=-8
2x-3x=-8+2+3
-x=-3
x=3
spr:
2(3-1)-3(3+1)=-8
2*2-3*4=-8
4-12=-8
-8=-8
f)
4(x+6)-8=2(x+6)
4x+24-8=2x+12
4x-2x=12-24+8
2x=-4
x=-2
spr:
4(-2+6)-8=2(-2+6)
4*4-8=2*4
16-8=8
8=8
g)
-3(x-2)-5=3(x+5)+4
-3x+6-5=3x+15+4
-3x-3x=15+4-6+5
0≠18
h)
x-1+2(x-2) + 3(x-3)= 4(x-2)
x-1+2x-4+3x-9=4x-8
x+2x+3x-4x=-8+1+4+9
2x=6
x=3
spr:
3-1+2(3-2)+3(3-3)=4(3-2)
3-1+2*1+3*0=4*1
3-1+2+0=4
4=4