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x+3x+(3x*2)=840
We move all terms to the left:
x+3x+(3x*2)-(840)=0
We add all the numbers together, and all the variables
x+3x+(+3x*2)-840=0
We add all the numbers together, and all the variables
4x+(+3x*2)-840=0
We get rid of parentheses
4x+3x*2-840=0
Wy multiply elements
4x+6x-840=0
We add all the numbers together, and all the variables
10x-840=0
We move all terms containing x to the left, all other terms to the right
10x=840
x=840/10
x=84
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