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54=4x+5*20
We move all terms to the left:
54-(4x+5*20)=0
We add all the numbers together, and all the variables
-(4x+100)+54=0
We get rid of parentheses
-4x-100+54=0
We add all the numbers together, and all the variables
-4x-46=0
We move all terms containing x to the left, all other terms to the right
-4x=46
x=46/-4
x=-11+1/2
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