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2x+14+(3x-21)=90
We move all terms to the left:
2x+14+(3x-21)-(90)=0
We add all the numbers together, and all the variables
2x+(3x-21)-76=0
We get rid of parentheses
2x+3x-21-76=0
We add all the numbers together, and all the variables
5x-97=0
We move all terms containing x to the left, all other terms to the right
5x=97
x=97/5
x=19+2/5
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