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x in (-oo:+oo)
x+7 = (1/3)*(4*x-2) // - (1/3)*(4*x-2)
x-((1/3)*(4*x-2))+7 = 0
(-1/3)*(4*x-2)+x+7 = 0
x-1/3*(4*x-2)+7 = 0
x-1/3*(4*x-2)+7 = 0
2/3-1/3*x+7 = 0
23/3-1/3*x = 0
23/3-1/3*x = 0
23/3-1/3*x = 0 // - 23/3
-1/3*x = -23/3 // : -1/3
x = -23/3/(-1/3)
x = 23
x = 23
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