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x in (-oo:+oo)
-(4-x) = (3/4)*x-4.5 // - (3/4)*x-4.5
x-((3/4)*x)-4+4.5 = 0
x+(-3/4)*x-4+4.5 = 0
1/4*x+0.5 = 0 // - 0.5
1/4*x = -0.5 // : 1/4
x = -0.5/1/4
x = -2
x = -2
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