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(1/2)*x-9 = (1/5)*x-6 // - (1/5)*x-6
(1/2)*x-((1/5)*x)-9+6 = 0
(1/2)*x+(-1/5)*x-9+6 = 0
3/10*x-3 = 0 // + 3
3/10*x = 3 // : 3/10
x = 3/3/10
x = 10
x = 10
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