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x in (-oo:+oo)
2*(x/4+3) = 18 // - 18
2*(x/4+3)-18 = 0
2*(1/4*x+3)-18 = 0
2*(1/4*x+3)-18 = 0
1/2*x-12 = 0
1/2*x-12 = 0
1/2*x-12 = 0 // + 12
1/2*x = 12 // : 1/2
x = 12/1/2
x = 24
x = 24
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