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(1/2)*x+(1/3)*x = (1/6)*x-5 // - (1/6)*x-5
(1/2)*x+(1/3)*x-((1/6)*x)+5 = 0
(1/2)*x+(1/3)*x+(-1/6)*x+5 = 0
2/3*x+5 = 0 // - 5
2/3*x = -5 // : 2/3
x = -5/2/3
x = -15/2
x = -15/2
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