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x in (-oo:+oo)
x/2-(3*4) = 53 // - 53
x/2-(3*4)-53 = 0
x/2-53-12 = 0
1/2*x-65 = 0 // + 65
1/2*x = 65 // : 1/2
x = 65/1/2
x = 130
x = 130
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