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2600-70x=4550-135x
We move all terms to the left:
2600-70x-(4550-135x)=0
We add all the numbers together, and all the variables
-70x-(-135x+4550)+2600=0
We get rid of parentheses
-70x+135x-4550+2600=0
We add all the numbers together, and all the variables
65x-1950=0
We move all terms containing x to the left, all other terms to the right
65x=1950
x=1950/65
x=30
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