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(21-4x)/2=5x
We move all terms to the left:
(21-4x)/2-(5x)=0
We add all the numbers together, and all the variables
(-4x+21)/2-5x=0
We add all the numbers together, and all the variables
-5x+(-4x+21)/2=0
We multiply all the terms by the denominator
-5x*2+(-4x+21)=0
Wy multiply elements
-10x+(-4x+21)=0
We get rid of parentheses
-10x-4x+21=0
We add all the numbers together, and all the variables
-14x+21=0
We move all terms containing x to the left, all other terms to the right
-14x=-21
x=-21/-14
x=1+1/2
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