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x in (-oo:+oo)
X-2 = (30-x)/3 // - (30-x)/3
X-((30-x)/3)-2 = 0
(-1*(30-x))/3+X-2 = 0
(-1*(30-x))/3+(3*X)/3+(-2*3)/3 = 0
3*X-1*(30-x)-2*3 = 0
3*X+x-30-6 = 0
3*X+x-36 = 0
(3*X+x-36)/3 = 0
(3*X+x-36)/3 = 0 // * 3
3*X+x-36 = 0
3*X+x-36 = 0 // - 3*X-36
x = -(3*X-36)
x = 36-(3*X)
x = 36-(3*X)
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