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(1/2)*x-50 = (1/6)*x-30 // - (1/6)*x-30
(1/2)*x-((1/6)*x)-50+30 = 0
(1/2)*x+(-1/6)*x-50+30 = 0
1/3*x-20 = 0 // + 20
1/3*x = 20 // : 1/3
x = 20/1/3
x = 60
x = 60
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