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2*x+x+1/2-120-30+15 = 180 // - 180
2*x+x+1/2-180-120-30+15 = 0
3*x-629/2 = 0 // + 629/2
3*x = 629/2 // : 3
x = 629/2/3
x = 629/6
x = 629/6
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