x + y = 24
x = 24 - y
7x + 5y = 146
7(24 - y) + 5y = 146
168 - 7y + 5y = 146
-2y = -22
y = 11
x = 24 - 11
x = 13
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x + y = 24
x = 24 - y
7x + 5y = 146
7(24 - y) + 5y = 146
168 - 7y + 5y = 146
-2y = -22
y = 11
x = 24 - 11
x = 13