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3.5*(x-(8/4)) = 2.8 // - 2.8
3.5*(x-(8/4))-2.8 = 0
3.5*(x-2)-2.8 = 0
3.5*(x-2)-2.8 = 0
3.5*x-9.8 = 0
3.5*x-9.8 = 0
3.5*x-9.8 = 0 // + 9.8
3.5*x = 9.8 // : 3.5
x = 9.8/3.5
x = 2.8
x = 2.8
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