well its impossible to answer since there is no x=? if it was 5x+20=40 then x=4 5 x 4=20+20=40
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2x + x + 4 +2x = x + 20 5x + 4 = x + 20 5x - x = 20 - 4 4x = 16 x = 4
5, (x + 4).
5X + 25 = 20 subtract 25 from each side 5X + 25 - 25 = 20 - 25 5X = - 5 divide both side integers by 5 X = - 1 check 5(-1) + 25 = 20 - 5 + 25 = 20 20 = 20 checks
-10x + 5x = -5x
10x - 5x + 5x = 10x