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(x+y)/5 = 63 // - 63
(x+y)/5-63 = 0
(x+y)/5+(-63*5)/5 = 0
x+y-63*5 = 0
x+y-315 = 0
(x+y-315)/5 = 0
(x+y-315)/5 = 0 // * 5
x+y-315 = 0
x+y-315 = 0 // - y-315
x = -(y-315)
x = 315-y
x = 315-y
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