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3x+2y= -4 | x5 | 15x+10y = -20
-------------------- -
-19 y = 95
y = -5
5x - 3y = 25
5x - 3(-5) = 25
5x +15 = 25
5x = 10
x = 2
y - 4x = -5 -4(2) = -5 - 8 = -13