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=> 6x - 4y = 20
6x - 9y = 30
------------------------ (-)
5y =-10
y = -2
3x - 2y = 10
3x - 2(-2) = 10
3x + 4 = 10
3x = 6
x = 2
4x - 8y = 4(2) - 8(-2) = 8 + 16 = 24 CMIIW