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5x + 20 = 4x +30 5x - 4x = 30 - 20 x = 10
30
-5x-5=25 -5x=30 x=-6
-5x + 30 = 20 -5x + 30 - 30 = 20 - 30 -5x = -10 -5x / -5 = -10 / -5 x = 2
5x -6y=-30 5x-6y=30 (2x+3y) (2x-3y)=30 4x+6y=30 4x=30 x=30/4