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(1/10)*(x-1) = (2/5)*(x+7)-((1/5)*x) // - (2/5)*(x+7)-((1/5)*x)
(1/10)*(x-1)-((2/5)*(x+7))+(1/5)*x = 0
(1/10)*(x-1)+(-2/5)*(x+7)+(1/5)*x = 0
1/10*(x-1)-2/5*(x+7)+x/5 = 0
(1/10*5*(x-1))/5+(-2/5*5*(x+7))/5+x/5 = 0
1/10*5*(x-1)-2/5*5*(x+7)+x = 0
x-3/2*x-29/2 = 0
-1/2*x-29/2 = 0
(-1/2*x-29/2)/5 = 0
(-1/2*x-29/2)/5 = 0 // * 5
-1/2*x-29/2 = 0
-1/2*x-29/2 = 0 // + 29/2
-1/2*x = 29/2 // : -1/2
x = 29/2/(-1/2)
x = -29
x = -29
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