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2*x-(3*((1/2)*x-(7/2))) = 13 // - 13
2*x-(3*((1/2)*x-(7/2)))-13 = 0
2*x-3*((1/2)*x-7/2)-13 = 0
2*x-3*(1/2*x-7/2)-13 = 0
2*x-3*(1/2*x-7/2)-13 = 0
1/2*x-13+21/2 = 0
1/2*x-5/2 = 0
1/2*x-5/2 = 0
1/2*x-5/2 = 0 // + 5/2
1/2*x = 5/2 // : 1/2
x = 5/2/1/2
x = 5
x = 5
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