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6(1-4x)+7(2+5x)=42
We move all terms to the left:
6(1-4x)+7(2+5x)-(42)=0
We add all the numbers together, and all the variables
6(-4x+1)+7(5x+2)-42=0
We multiply parentheses
-24x+35x+6+14-42=0
We add all the numbers together, and all the variables
11x-22=0
We move all terms containing x to the left, all other terms to the right
11x=22
x=22/11
x=2
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