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x in (-oo:+oo)
(-2/3)*x-(7/12) = 4 // - 4
(-2/3)*x-(7/12)-4 = 0
(-2/3)*x-7/12-4 = 0
-2/3*x-55/12 = 0 // + 55/12
-2/3*x = 55/12 // : -2/3
x = 55/12/(-2/3)
x = -55/8
x = -55/8
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