20x-21x=7-8

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Solution for 20x-21x=7-8 equation:



20x-21x=7-8
We move all terms to the left:
20x-21x-(7-8)=0
We add all the numbers together, and all the variables
20x-21x-(-1)=0
We add all the numbers together, and all the variables
-1x+1=0
We move all terms containing x to the left, all other terms to the right
-x=-1
x=-1/-1
x=1

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