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4*x = (1/2)*(2*x+7*x-4-1) // - (1/2)*(2*x+7*x-4-1)
4*x-((1/2)*(2*x+7*x-4-1)) = 0
(-1/2)*(2*x+7*x-4-1)+4*x = 0
4*x-1/2*(9*x-5) = 0
4*x-1/2*(9*x-5) = 0
5/2-1/2*x = 0
5/2-1/2*x = 0
5/2-1/2*x = 0 // - 5/2
-1/2*x = -5/2 // : -1/2
x = -5/2/(-1/2)
x = 5
x = 5
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