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x in (-oo:+oo)
x/2-(3*12) = 53 // - 53
x/2-(3*12)-53 = 0
x/2-53-36 = 0
1/2*x-89 = 0 // + 89
1/2*x = 89 // : 1/2
x = 89/1/2
x = 178
x = 178
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