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x in (-oo:+oo)
(3/4)*(x+8) = 18 // - 18
(3/4)*(x+8)-18 = 0
3/4*(x+8)-18 = 0
3/4*(x+8)-18 = 0
3/4*x-12 = 0
3/4*x-12 = 0
3/4*x-12 = 0 // + 12
3/4*x = 12 // : 3/4
x = 12/3/4
x = 16
x = 16
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