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6x-4x=-20+21
We move all terms to the left:
6x-4x-(-20+21)=0
We add all the numbers together, and all the variables
6x-4x-1=0
We add all the numbers together, and all the variables
2x-1=0
We move all terms containing x to the left, all other terms to the right
2x=1
x=1/2
x=1/2
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