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(5/5)*x+(2/5)*x+15.3 = 74.8 // - 74.8
(5/5)*x+(2/5)*x-74.8+15.3 = 0
7/5*x-59.5 = 0 // + 59.5
7/5*x = 59.5 // : 7/5
x = 59.5/7/5
x = 42.5
x = 42.5
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