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-3(2x+6)=31+9x
We move all terms to the left:
-3(2x+6)-(31+9x)=0
We add all the numbers together, and all the variables
-3(2x+6)-(9x+31)=0
We multiply parentheses
-6x-(9x+31)-18=0
We get rid of parentheses
-6x-9x-31-18=0
We add all the numbers together, and all the variables
-15x-49=0
We move all terms containing x to the left, all other terms to the right
-15x=49
x=49/-15
x=-3+4/15
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