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40-2x=4-6x
We move all terms to the left:
40-2x-(4-6x)=0
We add all the numbers together, and all the variables
-2x-(-6x+4)+40=0
We get rid of parentheses
-2x+6x-4+40=0
We add all the numbers together, and all the variables
4x+36=0
We move all terms containing x to the left, all other terms to the right
4x=-36
x=-36/4
x=-9
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