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3x+12(3.5+.25x)=42
We move all terms to the left:
3x+12(3.5+.25x)-(42)=0
We add all the numbers together, and all the variables
3x+12(.25x+3.5)-42=0
We multiply parentheses
3x+12x+42-42=0
We add all the numbers together, and all the variables
15x=0
x=0/15
x=0
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