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48=7x+20
We move all terms to the left:
48-(7x+20)=0
We get rid of parentheses
-7x-20+48=0
We add all the numbers together, and all the variables
-7x+28=0
We move all terms containing x to the left, all other terms to the right
-7x=-28
x=-28/-7
x=+4
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