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x in (-oo:+oo)
3*(2*x+2/3)+2*x = 18 // - 18
3*(2*x+2/3)+2*x-18 = 0
3*(2*x+2/3)+2*x-18 = 0
8*x-18+2 = 0
8*x-16 = 0
8*x-16 = 0
8*x-16 = 0 // + 16
8*x = 16 // : 8
x = 16/8
x = 2
x = 2
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