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x in (-oo:+oo)
(-2/3)*x+6 = (5/6)*x+7 // - (5/6)*x+7
(-2/3)*x-((5/6)*x)-7+6 = 0
(-2/3)*x+(-5/6)*x-7+6 = 0
-3/2*x-1 = 0 // + 1
-3/2*x = 1 // : -3/2
x = 1/(-3/2)
x = -2/3
x = -2/3
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