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15=4x+6-21-48
We move all terms to the left:
15-(4x+6-21-48)=0
We add all the numbers together, and all the variables
-(4x-63)+15=0
We get rid of parentheses
-4x+63+15=0
We add all the numbers together, and all the variables
-4x+78=0
We move all terms containing x to the left, all other terms to the right
-4x=-78
x=-78/-4
x=19+1/2
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