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3 = (5*x)/4-7 // - (5*x)/4-7
3-((5*x)/4)+7 = 0
(-5/4)*x+3+7 = 0
10-5/4*x = 0 // - 10
-5/4*x = -10 // : -5/4
x = -10/(-5/4)
x = 8
x = 8
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