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(7*x+5*x)/50 = 5.59 // - 5.59
(7*x+5*x)/50-5.59 = 0
(12*x)/50-5.59 = 0
(12*x)/50+(-5.59*50)/50 = 0
12*x-5.59*50 = 0
12*x-279.5 = 0
(12*x-279.5)/50 = 0
(12*x-279.5)/50 = 0 // * 50
12*x-279.5 = 0
12*x-279.5 = 0 // + 279.5
12*x = 279.5 // : 12
x = 279.5/12
x = 23.29166667
x = 23.29166667
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