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5x+2(-4x-1)=7
We move all terms to the left:
5x+2(-4x-1)-(7)=0
We multiply parentheses
5x-8x-2-7=0
We add all the numbers together, and all the variables
-3x-9=0
We move all terms containing x to the left, all other terms to the right
-3x=9
x=9/-3
x=-3
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