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644=0.3x+x
We move all terms to the left:
644-(0.3x+x)=0
We add all the numbers together, and all the variables
-(+1.3x)+644=0
We get rid of parentheses
-1.3x+644=0
We move all terms containing x to the left, all other terms to the right
-1.3x=-644
x=-644/-1.3
x=495+0.5/1.3
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