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x in (-oo:+oo)
3*(1/4)*x = 25 // - 25
3*(1/4)*x-25 = 0
3/4*x-25 = 0 // + 25
3/4*x = 25 // : 3/4
x = 25/3/4
x = 100/3
x = 100/3
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