13x-5x-7=4x+21

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Solution for 13x-5x-7=4x+21 equation:



13x-5x-7=4x+21
We move all terms to the left:
13x-5x-7-(4x+21)=0
We add all the numbers together, and all the variables
8x-(4x+21)-7=0
We get rid of parentheses
8x-4x-21-7=0
We add all the numbers together, and all the variables
4x-28=0
We move all terms containing x to the left, all other terms to the right
4x=28
x=28/4
x=7

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