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2*(x+5)+2*x = 2*(x+7)+2*(1/2)*x // - 2*(x+7)+2*(1/2)*x
2*(x+5)-(2*(x+7))+2*x-(2*(1/2)*x) = 0
2*(x+5)-2*(x+7)+2*x-x = 0
2*(x+5)-2*(x+7)+2*x-x = 0
2*x-x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x = 4
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