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(4/5)*x-((1/4)*x)+14 = 9/10 // - 9/10
(4/5)*x-((1/4)*x)-(9/10)+14 = 0
(4/5)*x+(-1/4)*x-9/10+14 = 0
11/20*x+131/10 = 0 // - 131/10
11/20*x = -131/10 // : 11/20
x = -131/10/11/20
x = -262/11
x = -262/11
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