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(1/7)*x-16 = (1/6)*x-18 // - (1/6)*x-18
(1/7)*x-((1/6)*x)-16+18 = 0
(1/7)*x+(-1/6)*x-16+18 = 0
2-1/42*x = 0 // - 2
-1/42*x = -2 // : -1/42
x = -2/(-1/42)
x = 84
x = 84
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