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-5x+4(2x-9)=-42
We move all terms to the left:
-5x+4(2x-9)-(-42)=0
We add all the numbers together, and all the variables
-5x+4(2x-9)+42=0
We multiply parentheses
-5x+8x-36+42=0
We add all the numbers together, and all the variables
3x+6=0
We move all terms containing x to the left, all other terms to the right
3x=-6
x=-6/3
x=-2
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