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x+3*x+(1/2)*x-77-26+13 = 180 // - 180
x+3*x+(1/2)*x-180-77-26+13 = 0
9/2*x-270 = 0 // + 270
9/2*x = 270 // : 9/2
x = 270/9/2
x = 60
x = 60
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