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x in (-oo:+oo)
x-40 = (3*x)/4 // - (3*x)/4
x-((3*x)/4)-40 = 0
x+(-3/4)*x-40 = 0
1/4*x-40 = 0 // + 40
1/4*x = 40 // : 1/4
x = 40/1/4
x = 160
x = 160
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