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x in (-oo:+oo)
x-((2/3)*x) = 87 // - 87
x-((2/3)*x)-87 = 0
x+(-2/3)*x-87 = 0
1/3*x-87 = 0 // + 87
1/3*x = 87 // : 1/3
x = 87/1/3
x = 261
x = 261
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