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X+3X+(6X+1)=770
We move all terms to the left:
X+3X+(6X+1)-(770)=0
We add all the numbers together, and all the variables
4X+(6X+1)-770=0
We get rid of parentheses
4X+6X+1-770=0
We add all the numbers together, and all the variables
10X-769=0
We move all terms containing X to the left, all other terms to the right
10X=769
X=769/10
X=76+9/10
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