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2x+x=7-4
3x=3 | :3
x=1
b) -3x+1=-2(x-3)-3
-3x+1=-2x+6 -3
-3x+1=-2x+3
-3x+2x=3-1
x=2
c) 10+4(1-x)=2x-6
10+ 4-4x=2x-6
14-4x=2x-6
14+6=2x+4x
20=6x |:6
x=20/6 = 3 2/6
d)2x-1/2(3x-2)=7/4-x
2x-1,5x+1=7/4-x
0,5x+x=7/4
1,5x=7/4
3/2 x = 7/4 |*2/3
x=7/6
e) 3x-2(1-2x)=0,5(3x+1,5)
3x-2+4x=1,5x+0.75
7x-2=1.5x+0.75
7x-1,5x= 0.75+2
5,5x= 2.75 |: 5,5
x=0.5
f) 3(3-5y)=90-5(3y-2)
9-15y=90-15y+10
9-15y=100-15y
-15y+15y=100-9
0=91 - r. fałszywe