x+3x-4=-3(2x+3)

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Solution for x+3x-4=-3(2x+3) equation: 



x+3x-4=-3(2x+3)

We move all terms to the left:

x+3x-4-(-3(2x+3))=0

We add all the numbers together, and all the variables

4x-(-3(2x+3))-4=0



We calculate terms in parentheses: -(-3(2x+3)), so:

-3(2x+3)

We multiply parentheses

-6x-9

Back to the equation:

-(-6x-9)



We get rid of parentheses

4x+6x+9-4=0

We add all the numbers together, and all the variables

10x+5=0

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

10x=-5

x=-5/10

x=-1/2

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