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