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x+(2x)+(x+50)=490
We move all terms to the left:
x+(2x)+(x+50)-(490)=0
We add all the numbers together, and all the variables
3x+(x+50)-490=0
We get rid of parentheses
3x+x+50-490=0
We add all the numbers together, and all the variables
4x-440=0
We move all terms containing x to the left, all other terms to the right
4x=440
x=440/4
x=110
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