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2x-4 = 20 2x = 20+4 2x = 24 x = 12
-2x+20 = 3x 20 = 3x+2x 20 = 5x 4 = x So x = 4
-2x+14=20 x=-3
To find x -2x = 20 divide both sides by negative 2 -2x/-2 = 20/ -2 x = -10
x = 20