3x=-4x+280

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Solution for 3x=-4x+280 equation: 



3x=-4x+280

We move all terms to the left:

3x-(-4x+280)=0

We get rid of parentheses

3x+4x-280=0

We add all the numbers together, and all the variables

7x-280=0

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

7x=280

x=280/7

x=40

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