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4*x+x+(1/2)*x-302-20+15 = 180 // - 180
4*x+x+(1/2)*x-302-180-20+15 = 0
11/2*x-487 = 0 // + 487
11/2*x = 487 // : 11/2
x = 487/11/2
x = 974/11
x = 974/11
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