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4x-30=9x-45
We move all terms to the left:
4x-30-(9x-45)=0
We get rid of parentheses
4x-9x+45-30=0
We add all the numbers together, and all the variables
-5x+15=0
We move all terms containing x to the left, all other terms to the right
-5x=-15
x=-15/-5
x=+3
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