x+3x+4=72.

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Solution for x+3x+4=72. equation: 



x+3x+4=72.

We move all terms to the left:

x+3x+4-(72.)=0

We add all the numbers together, and all the variables

x+3x+4-72=0

We add all the numbers together, and all the variables

4x-68=0

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

4x=68

x=68/4

x=17

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