9x+13-7x+21=4

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Solution for 9x+13-7x+21=4 equation: 



9x+13-7x+21=4

We move all terms to the left:

9x+13-7x+21-(4)=0

We add all the numbers together, and all the variables

2x+30=0

We move all terms containing x to the left, all other terms to the right

2x=-30

x=-30/2

x=-15

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