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(4/5)*x+2/3 = 1/2-x // - 1/2-x
(4/5)*x+x+2/3-(1/2) = 0
(4/5)*x+x+2/3-1/2 = 0
9/5*x+1/6 = 0 // - 1/6
9/5*x = -1/6 // : 9/5
x = -1/6/9/5
x = -5/54
x = -5/54
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