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6x+12x+90=1806x+12x+90=180
We move all terms to the left:
6x+12x+90-(1806x+12x+90)=0
We add all the numbers together, and all the variables
6x+12x-(1818x+90)+90=0
We add all the numbers together, and all the variables
18x-(1818x+90)+90=0
We get rid of parentheses
18x-1818x-90+90=0
We add all the numbers together, and all the variables
-1800x=0
x=0/-1800
x=0
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