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(1/2)*x+4/5 = 71/120 // - 71/120
(1/2)*x+4/5-(71/120) = 0
(1/2)*x+4/5-71/120 = 0
1/2*x+5/24 = 0 // - 5/24
1/2*x = -5/24 // : 1/2
x = -5/24/1/2
x = -5/12
x = -5/12
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