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5x+30=7x+20
We move all terms to the left:
5x+30-(7x+20)=0
We get rid of parentheses
5x-7x-20+30=0
We add all the numbers together, and all the variables
-2x+10=0
We move all terms containing x to the left, all other terms to the right
-2x=-10
x=-10/-2
x=+5
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