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