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30*x = 5*(x-4)+(1/2)*x // - 5*(x-4)+(1/2)*x
30*x-(5*(x-4))-((1/2)*x) = 0
30*x-5*(x-4)+(-1/2)*x = 0
30*x-5*(x-4)-x/2 = 0
(-5*2*(x-4))/2+(2*30*x)/2-x/2 = 0
2*30*x-5*2*(x-4)-x = 0
50*x-x+40 = 0
49*x+40 = 0
(49*x+40)/2 = 0
(49*x+40)/2 = 0 // * 2
49*x+40 = 0
49*x+40 = 0 // - 40
49*x = -40 // : 49
x = -40/49
x = -40/49
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