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x in (-oo:+oo)
x/1.5-(x/3) = 7 // - 7
x/1.5-(x/3)-7 = 0
0.33333334*x-7 = 0 // + 7
0.33333334*x = 7 // : 0.33333334
x = 7/0.33333334
x = 20.99999958
x = 20.99999958
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