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4+2x=4(5-1)
We move all terms to the left:
4+2x-(4(5-1))=0
We add all the numbers together, and all the variables
2x+4-(44)=0
We add all the numbers together, and all the variables
2x-40=0
We move all terms containing x to the left, all other terms to the right
2x=40
x=40/2
x=20
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