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2*((90-6*x)/2)+14*x = 110 // - 110
2*((90-6*x)/2)+14*x-110 = 0
(2*(90-6*x))/2+14*x-110 = 0
(2*(90-6*x))/2+(2*14*x)/2+(-110*2)/2 = 0
2*(90-6*x)+2*14*x-110*2 = 0
16*x-220+180 = 0
16*x-40 = 0
(16*x-40)/2 = 0
(16*x-40)/2 = 0 // * 2
16*x-40 = 0
16*x-40 = 0 // + 40
16*x = 40 // : 16
x = 40/16
x = 5/2
x = 5/2
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