#Simultaneous equation

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unborn abyssBOT
lunar wing
#

we multiply #1 by 'a' and #2 by (a+b):
1: a(a+b)x + acy = abc
2: (a+b)(b+c)y + a(a+b)x = -ab(a+b)
subtract both eq:
acy - (a+b)(b+c)y = abc + ab(a+b) ---> y = ... ---> x = ...