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x+(x*0.65)=1800
We move all terms to the left:
x+(x*0.65)-(1800)=0
We add all the numbers together, and all the variables
x+(+x*0.65)-1800=0
We get rid of parentheses
x+x*0.65-1800=0
Wy multiply elements
x+0.65x-1800=0
We add all the numbers together, and all the variables
1.65x-1800=0
We move all terms containing x to the left, all other terms to the right
1.65x=1800
x=1800/1.65
x=1090+1/1.1
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