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7 = (10-x)/2 // - (10-x)/2
7-((10-x)/2) = 0
(-1*(10-x))/2+7 = 0
(-1*(10-x))/2+(2*7)/2 = 0
2*7-1*(10-x) = 0
x+4 = 0
(x+4)/2 = 0
(x+4)/2 = 0 // * 2
x+4 = 0
x+4 = 0 // - 4
x = -4
x = -4
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