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3*x-((1/2)*(126-x)) = 322 // - 322
3*x-((1/2)*(126-x))-322 = 0
(-1/2)*(126-x)+3*x-322 = 0
3*x-1/2*(126-x)-322 = 0
3*x-1/2*(126-x)-322 = 0
7/2*x-322-63 = 0
7/2*x-385 = 0
7/2*x-385 = 0
7/2*x-385 = 0 // + 385
7/2*x = 385 // : 7/2
x = 385/7/2
x = 110
x = 110
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