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## Sagot :

42-21x+12x=44

then reduce your x's on the left side, so -21+12 is -9, so your next equation would be

42-9x=44

then subtract 42 from each side to get x by itself, so then you get

-9x=2

then divide each side by -9, so then x=2/-9!

so now its 21 x 2 +11 = 44 ( you added -x which is -1x + 12)

then you do 42 + 11 = 44 (21 x 2 =42)

52 = 44 (42+11)

and if the answer is what i think it is, it should be no, it is not equal. if not then idk but thats how you solve it.