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(2/5)*x-((3/2)*x) = 3/4+3 // - 3/4+3
(2/5)*x-((3/2)*x)-(3/4)-3 = 0
(2/5)*x+(-3/2)*x-3/4-3 = 0
-11/10*x-15/4 = 0 // + 15/4
-11/10*x = 15/4 // : -11/10
x = 15/4/(-11/10)
x = -75/22
x = -75/22
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