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x in (-oo:+oo)
(1/6)*x+(1/5)*x+(3/10)*x = 90 // - 90
(1/6)*x+(1/5)*x+(3/10)*x-90 = 0
2/3*x-90 = 0 // + 90
2/3*x = 90 // : 2/3
x = 90/2/3
x = 135
x = 135
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