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(1/5)*x+6*x-6 = -91/10 // + -91/10
(1/5)*x+6*x-(-91/10)-6 = 0
(1/5)*x+6*x+91/10-6 = 0
31/5*x+31/10 = 0 // - 31/10
31/5*x = -31/10 // : 31/5
x = -31/10/31/5
x = -1/2
x = -1/2
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