3x-(-4x)=144

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Solution for 3x-(-4x)=144 equation: 



3x-(-4x)=144

We move all terms to the left:

3x-(-4x)-(144)=0

We get rid of parentheses

3x+4x-144=0

We add all the numbers together, and all the variables

7x-144=0

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

7x=144

x=144/7

x=20+4/7

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