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(8/2)*x-((5/2)*x) = 3 // - 3
(8/2)*x-((5/2)*x)-3 = 0
(8/2)*x+(-5/2)*x-3 = 0
3/2*x-3 = 0 // + 3
3/2*x = 3 // : 3/2
x = 3/3/2
x = 2
x = 2
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