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X in (-oo:+oo)
(2/3)*(X+6)+(1/2)*X = 42 // - 42
(2/3)*(X+6)+(1/2)*X-42 = 0
2/3*(X+6)+X/2-42 = 0
(2/3*2*(X+6))/2+X/2+(-42*2)/2 = 0
2/3*2*(X+6)+X-42*2 = 0
7/3*X-84+8 = 0
7/3*X-76 = 0
(7/3*X-76)/2 = 0
(7/3*X-76)/2 = 0 // * 2
7/3*X-76 = 0
7/3*X-76 = 0 // + 76
7/3*X = 76 // : 7/3
X = 76/7/3
X = 228/7
X = 228/7
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