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