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x in (-oo:+oo)
(1/4)*x+(1/5)*x = 90 // - 90
(1/4)*x+(1/5)*x-90 = 0
9/20*x-90 = 0 // + 90
9/20*x = 90 // : 9/20
x = 90/9/20
x = 200
x = 200
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