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80+x+(x*4)+x+40=540
We move all terms to the left:
80+x+(x*4)+x+40-(540)=0
We add all the numbers together, and all the variables
x+(+x*4)+x+80+40-540=0
We add all the numbers together, and all the variables
2x+(+x*4)-420=0
We get rid of parentheses
2x+x*4-420=0
Wy multiply elements
2x+4x-420=0
We add all the numbers together, and all the variables
6x-420=0
We move all terms containing x to the left, all other terms to the right
6x=420
x=420/6
x=70
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