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3*x-((15*x)/4)+5 = 29/4 // - 29/4
3*x-((15*x)/4)-(29/4)+5 = 0
3*x+(-15/4)*x-29/4+5 = 0
-3/4*x-9/4 = 0 // + 9/4
-3/4*x = 9/4 // : -3/4
x = 9/4/(-3/4)
x = -3
x = -3
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