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6x-2(4x-5)=40
We move all terms to the left:
6x-2(4x-5)-(40)=0
We multiply parentheses
6x-8x+10-40=0
We add all the numbers together, and all the variables
-2x-30=0
We move all terms containing x to the left, all other terms to the right
-2x=30
x=30/-2
x=-15
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