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2x+(x+10)=130
We move all terms to the left:
2x+(x+10)-(130)=0
We get rid of parentheses
2x+x+10-130=0
We add all the numbers together, and all the variables
3x-120=0
We move all terms containing x to the left, all other terms to the right
3x=120
x=120/3
x=40
| 15x-10=6x+1-2x | | 111-5x=96 | | 2x=4+26 | | 5+7x=3(2x+4)+1 | | 29-6x=6(x+6) |