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(4/5)*x+(1/4)*x+14 = (9/10)*x // - (9/10)*x
(4/5)*x+(1/4)*x-((9/10)*x)+14 = 0
(4/5)*x+(1/4)*x+(-9/10)*x+14 = 0
3/20*x+14 = 0 // - 14
3/20*x = -14 // : 3/20
x = -14/3/20
x = -280/3
x = -280/3
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