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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
-5x-4x/2+21=0
We multiply all the terms by the denominator
-5x*2-4x+21*2=0
We add all the numbers together, and all the variables
-4x-5x*2+42=0
Wy multiply elements
-4x-10x+42=0
We add all the numbers together, and all the variables
-14x+42=0
We move all terms containing x to the left, all other terms to the right
-14x=-42
x=-42/-14
x=+3
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