x+19+20+x=21

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Solution for x+19+20+x=21 equation:



x+19+20+x=21
We move all terms to the left:
x+19+20+x-(21)=0
We add all the numbers together, and all the variables
2x+18=0
We move all terms containing x to the left, all other terms to the right
2x=-18
x=-18/2
x=-9

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