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X in (-oo:+oo)
7*X+(3*X)/2 = 270 // - 270
7*X+(3*X)/2-270 = 0
17/2*X-270 = 0 // + 270
17/2*X = 270 // : 17/2
X = 270/17/2
X = 540/17
X = 540/17
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