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2x+4+5x+4=9x+3
We move all terms to the left:
2x+4+5x+4-(9x+3)=0
We add all the numbers together, and all the variables
7x-(9x+3)+8=0
We get rid of parentheses
7x-9x-3+8=0
We add all the numbers together, and all the variables
-2x+5=0
We move all terms containing x to the left, all other terms to the right
-2x=-5
x=-5/-2
x=2+1/2
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