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(2/3)*x-7 = (1/6)*x // - (1/6)*x
(2/3)*x-((1/6)*x)-7 = 0
(2/3)*x+(-1/6)*x-7 = 0
1/2*x-7 = 0 // + 7
1/2*x = 7 // : 1/2
x = 7/1/2
x = 14
x = 14
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