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x in (-oo:+oo)
x-15 = (2/3)*x // - (2/3)*x
x-((2/3)*x)-15 = 0
x+(-2/3)*x-15 = 0
1/3*x-15 = 0 // + 15
1/3*x = 15 // : 1/3
x = 15/1/3
x = 45
x = 45
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