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405+0.3x=1.8x
We move all terms to the left:
405+0.3x-(1.8x)=0
We add all the numbers together, and all the variables
0.3x-(+1.8x)+405=0
We get rid of parentheses
0.3x-1.8x+405=0
We add all the numbers together, and all the variables
-1.5x+405=0
We move all terms containing x to the left, all other terms to the right
-1.5x=-405
x=-405/-1.5
x=+270
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