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3(x+1800)=900
We move all terms to the left:
3(x+1800)-(900)=0
We multiply parentheses
3x+5400-900=0
We add all the numbers together, and all the variables
3x+4500=0
We move all terms containing x to the left, all other terms to the right
3x=-4500
x=-4500/3
x=-1500
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