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-1x+3=-42+4x
We move all terms to the left:
-1x+3-(-42+4x)=0
We add all the numbers together, and all the variables
-1x-(4x-42)+3=0
We get rid of parentheses
-1x-4x+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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