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6440+.405x=2997+1.21x
We move all terms to the left:
6440+.405x-(2997+1.21x)=0
We add all the numbers together, and all the variables
.405x-(1.21x+2997)+6440=0
We get rid of parentheses
.405x-1.21x-2997+6440=0
We add all the numbers together, and all the variables
-0.805x+3443=0
We move all terms containing x to the left, all other terms to the right
-0.805x=-3443
x=-3443/-0.805
x=4277+0.0149999999999/0.805
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