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7*x = (1/2)*(5*x+3) // - (1/2)*(5*x+3)
7*x-((1/2)*(5*x+3)) = 0
(-1/2)*(5*x+3)+7*x = 0
7*x-1/2*(5*x+3) = 0
7*x-1/2*(5*x+3) = 0
9/2*x-3/2 = 0
9/2*x-3/2 = 0
9/2*x-3/2 = 0 // + 3/2
9/2*x = 3/2 // : 9/2
x = 3/2/9/2
x = 1/3
x = 1/3
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