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6x+3=-42+x
We move all terms to the left:
6x+3-(-42+x)=0
We add all the numbers together, and all the variables
6x-(x-42)+3=0
We get rid of parentheses
6x-x+42+3=0
We add all the numbers together, and all the variables
5x+45=0
We move all terms containing x to the left, all other terms to the right
5x=-45
x=-45/5
x=-9
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