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x in (-oo:+oo)
(2/3)*(6*x+7) = -6 // + 6
(2/3)*(6*x+7)+6 = 0
2/3*(6*x+7)+6 = 0
2/3*(6*x+7)+6 = 0
4*x+32/3 = 0
4*x+32/3 = 0
4*x+32/3 = 0 // - 32/3
4*x = -32/3 // : 4
x = -32/3/4
x = -8/3
x = -8/3
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