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x+(x*2)+(x*6)=387
We move all terms to the left:
x+(x*2)+(x*6)-(387)=0
We add all the numbers together, and all the variables
x+(+x*2)+(+x*6)-387=0
We get rid of parentheses
x+x*2+x*6-387=0
Wy multiply elements
x+2x+6x-387=0
We add all the numbers together, and all the variables
9x-387=0
We move all terms containing x to the left, all other terms to the right
9x=387
x=387/9
x=43
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