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-4x+5=-8x*21
We move all terms to the left:
-4x+5-(-8x*21)=0
We get rid of parentheses
-4x+8x*21+5=0
Wy multiply elements
-4x+168x+5=0
We add all the numbers together, and all the variables
164x+5=0
We move all terms containing x to the left, all other terms to the right
164x=-5
x=-5/164
x=-5/164
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