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(3/2)*x-((1/2)*x)-7-4 = -13-1 // + -13-1
(3/2)*x-((1/2)*x)-7-4+1+13 = 0
(3/2)*x+(-1/2)*x-7-4+1+13 = 0
x+3 = 0 // - 3
x = -3
x = -3
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