x+x*2+x*2-4=21

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Solution for x+x*2+x*2-4=21 equation: 



x+x*2+x*2-4=21

We move all terms to the left:

x+x*2+x*2-4-(21)=0

We add all the numbers together, and all the variables

x+x*2+x*2-25=0

Wy multiply elements

x+2x+2x-25=0

We add all the numbers together, and all the variables

5x-25=0

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

5x=25

x=25/5

x=5

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