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x in (-oo:+oo)
(2/3)*x-(1/6) = -7 // + 7
(2/3)*x-(1/6)+7 = 0
(2/3)*x-1/6+7 = 0
2/3*x+41/6 = 0 // - 41/6
2/3*x = -41/6 // : 2/3
x = -41/6/2/3
x = -41/4
x = -41/4
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