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16=13+x.3
We move all terms to the left:
16-(13+x.3)=0
We add all the numbers together, and all the variables
-(x.3+13)+16=0
We get rid of parentheses
-x.3-13+16=0
We add all the numbers together, and all the variables
-x.3+3=0
We move all terms containing x to the left, all other terms to the right
-x.3=-3
x=-3/1
x=-3
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