x+4.x=7+13

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Solution for x+4.x=7+13 equation: 



x+4.x=7+13

We move all terms to the left:

x+4.x-(7+13)=0

We add all the numbers together, and all the variables

x+4.x-20=0

We add all the numbers together, and all the variables

5x-20=0

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

5x=20

x=20/5

x=4

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