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9=6.4x+13.4-7.5x
We move all terms to the left:
9-(6.4x+13.4-7.5x)=0
We add all the numbers together, and all the variables
-(-1.1x+13.4)+9=0
We get rid of parentheses
1.1x-13.4+9=0
We add all the numbers together, and all the variables
1.1x-4.4=0
We move all terms containing x to the left, all other terms to the right
1.1x=4.4
x=4.4/1.1
x=4
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