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(1/2)*(4*x+8) = (1/5)*(15-(20*x)) // - (1/5)*(15-(20*x))
(1/2)*(4*x+8)-((1/5)*(15-(20*x))) = 0
(1/2)*(4*x+8)+(-1/5)*(15-20*x) = 0
1/2*(4*x+8)-1/5*(15-20*x) = 0
1/2*(4*x+8)-1/5*(15-20*x) = 0
6*x+1 = 0
6*x+1 = 0
6*x+1 = 0 // - 1
6*x = -1 // : 6
x = -1/6
x = -1/6
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