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x in (-oo:+oo)
x = (5/6)*x+7 // - (5/6)*x+7
x-((5/6)*x)-7 = 0
x+(-5/6)*x-7 = 0
1/6*x-7 = 0 // + 7
1/6*x = 7 // : 1/6
x = 7/1/6
x = 42
x = 42
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