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A)
4-x=(32+x)-(2x+28)
4-x=32+x-2x-28
4-x=4-x
0=0
B)
9x-8x+(16+2x)=5(2-x)
x+16+2x=10-5x
3x+16=10-5x
8x=-6
x=-3/4
c)
7+3x=4(0,75x+7)
7 + 3x = 3x + 28
3x - 3x = 28 - 7
0 = 21