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8+x+9=4x+5
We move all terms to the left:
8+x+9-(4x+5)=0
We add all the numbers together, and all the variables
x-(4x+5)+17=0
We get rid of parentheses
x-4x-5+17=0
We add all the numbers together, and all the variables
-3x+12=0
We move all terms containing x to the left, all other terms to the right
-3x=-12
x=-12/-3
x=+4
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