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a)
1-5x=-9 ...//-1
-5x=-9-1
-5x=-10 ...//:(-5)
x=-10/-5
x=2
b)
6x+7=1-5x ...//-7
6x=1-5x-7 ...//+5x
6x+5x=-6
11x=-6 ...//:11
x=-6/11
3.
a)
1/3(3x-2)=2
x-2/3=2 ...//+2/3
x=2 +2/3
x= 2 2/3
b)
5(x/5-3)=315
x-15=315 ...//+15
x=315+15
x=330
c)
x+3/2*8=x-3
x+12=x-3 ...//-12
x=x-3-12 ...//-x
0=-15
równanie sprzeczne
d)
4(2x-3/4)=53
8x-3=53 ...//+3
8x=53+3 ...//:8
x=56/8
x=7
e)
2(x+7)=3(2x-5)
2x+14=6x-15 ...//-14
2x=6x-15-14 ...//-6x
2x-6x=-29
-4x=-29 ...//:(-4)
x=-29/-4
x=7 1/4
f)
3(x-5)+7=x+1
3x-15+7=x+1 ...//-x
2x-8=1 ...//+8
2x=1+8
2x=9 ...//:2
x=9/2
x=4 1/2
a) 1-5x=-9
-5x=-9-1
-5x=-10/:(-5)
x= 2
b)6x+7=1-5x
6x+5x=-7+1
11x=-6 /:11
x=-6/11
3.
a)1/3(3x-2)=2
1/3*3x-1/3*2=2
x-2/3=2
x=2-2/3
x=1 1/3
b)5(x/5-3)=315
x-15=315
x=315+15
x=330
c)x+3/2*8=x-3
x+12=x-3
x-x=-12-3
0=-15
d)4(2x-3/4)=53
8x-3=53
8x=53+3
8x=56 /:8
x=7
e)2(x+7)=3(2x-5)
2x+14=6x-15
14+15=6x-2x
29=4x /:4
7 1/4=x
f)3(x-5)+7=x+1
3x-15+7=x+1
3x-x=15-7+1
2x=9/:2
x=4,5