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2(x-23)+4(x-4)=40
We move all terms to the left:
2(x-23)+4(x-4)-(40)=0
We multiply parentheses
2x+4x-46-16-40=0
We add all the numbers together, and all the variables
6x-102=0
We move all terms containing x to the left, all other terms to the right
6x=102
x=102/6
x=17
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