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(2/7)*x+(3/5)*x+2/3 = 769/735 // - 769/735
(2/7)*x+(3/5)*x+2/3-(769/735) = 0
(2/7)*x+(3/5)*x+2/3-769/735 = 0
31/35*x-93/245 = 0 // + 93/245
31/35*x = 93/245 // : 31/35
x = 93/245/31/35
x = 3/7
x = 3/7
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