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5*x+(5/7)*x-(3/8) = 2371/504 // - 2371/504
5*x+(5/7)*x-(3/8)-(2371/504) = 0
5*x+(5/7)*x-3/8-2371/504 = 0
40/7*x-320/63 = 0 // + 320/63
40/7*x = 320/63 // : 40/7
x = 320/63/40/7
x = 8/9
x = 8/9
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