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(-5/4)*x = (-1/2)*x-3 // - (-1/2)*x-3
(-5/4)*x-((-1/2)*x)+3 = 0
(-5/4)*x+(1/2)*x+3 = 0
3-3/4*x = 0 // - 3
-3/4*x = -3 // : -3/4
x = -3/(-3/4)
x = 4
x = 4
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