6x-4x=12-21

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Solution for 6x-4x=12-21 equation: 



6x-4x=12-21

We move all terms to the left:

6x-4x-(12-21)=0

We add all the numbers together, and all the variables

6x-4x-(-9)=0

We add all the numbers together, and all the variables

2x+9=0

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

2x=-9

x=-9/2

x=-4+1/2

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