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666-4x=888-7x
We move all terms to the left:
666-4x-(888-7x)=0
We add all the numbers together, and all the variables
-4x-(-7x+888)+666=0
We get rid of parentheses
-4x+7x-888+666=0
We add all the numbers together, and all the variables
3x-222=0
We move all terms containing x to the left, all other terms to the right
3x=222
x=222/3
x=74
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