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2*x-((1/5)*(x-630)) = 0
(-1/5)*(x-630)+2*x = 0
2*x-1/5*(x-630) = 0
2*x-1/5*(x-630) = 0
9/5*x+126 = 0
9/5*x+126 = 0
9/5*x+126 = 0 // - 126
9/5*x = -126 // : 9/5
x = -126/9/5
x = -70
x = -70
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