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4x+15=7x+30
We move all terms to the left:
4x+15-(7x+30)=0
We get rid of parentheses
4x-7x-30+15=0
We add all the numbers together, and all the variables
-3x-15=0
We move all terms containing x to the left, all other terms to the right
-3x=15
x=15/-3
x=-5
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