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4x+1+5x-1+4x+1+5x-1=144
We move all terms to the left:
4x+1+5x-1+4x+1+5x-1-(144)=0
We add all the numbers together, and all the variables
18x-144=0
We move all terms containing x to the left, all other terms to the right
18x=144
x=144/18
x=8
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