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2x+3(4+x)=48
We move all terms to the left:
2x+3(4+x)-(48)=0
We add all the numbers together, and all the variables
2x+3(x+4)-48=0
We multiply parentheses
2x+3x+12-48=0
We add all the numbers together, and all the variables
5x-36=0
We move all terms containing x to the left, all other terms to the right
5x=36
x=36/5
x=7+1/5
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