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x in (-oo:+oo)
2*x-((2/3)*x) = 7-5 // - 7-5
2*x-((2/3)*x)-7+5 = 0
2*x+(-2/3)*x-7+5 = 0
4/3*x-2 = 0 // + 2
4/3*x = 2 // : 4/3
x = 2/4/3
x = 3/2
x = 3/2
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