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(1470/7)*(x-30) = 2150 // - 2150
(1470/7)*(x-30)-2150 = 0
210*(x-30)-2150 = 0
210*(x-30)-2150 = 0
210*x-8450 = 0
210*x-8450 = 0
210*x-8450 = 0 // + 8450
210*x = 8450 // : 210
x = 8450/210
x = 845/21
x = 845/21
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