a. 100(x-1)=100 | :100
x-1=1
x=2
б. 0.3(8-4x)=0.5(9-2.5x)-1.8 |*10
3(8-4x)=5(9-2.5x)-18
24-12x=45-12.5x-18
-12x+12.5x=45-18-24
0.5x=3 | *2
x=6
в. -2(4.1y-3)-3.5 - 1.8(0.5-5y) = 2.8 |*10
-20(4.1y-3)-35-18(0.5-5y)=28
-82y+60-35-9+90y=28
8y=28-60+35+9
8y=12
y=12/8=3/2=1.5
y=1.5
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a. 100(x-1)=100 | :100
x-1=1
x=2
б. 0.3(8-4x)=0.5(9-2.5x)-1.8 |*10
3(8-4x)=5(9-2.5x)-18
24-12x=45-12.5x-18
-12x+12.5x=45-18-24
0.5x=3 | *2
x=6
в. -2(4.1y-3)-3.5 - 1.8(0.5-5y) = 2.8 |*10
-20(4.1y-3)-35-18(0.5-5y)=28
-82y+60-35-9+90y=28
8y=28-60+35+9
8y=12
y=12/8=3/2=1.5
y=1.5