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x in (-oo:+oo)
(4*(x-a))/2 = 18 // - 18
(4*(x-a))/2-18 = 0
(4*(x-a))/2+(-18*2)/2 = 0
4*(x-a)-18*2 = 0
4*x-4*a-36 = 0
(4*x-4*a-36)/2 = 0
(4*x-4*a-36)/2 = 0 // * 2
4*x-4*a-36 = 0
4*x-4*a-36 = 0 // + -4*a-36
4*x = -(-4*a-36) // : 4
x = (-(-4*a-36))/4
x = (36-(-4*a))/4
x = (36-(-4*a))/4
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