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(x*10)+(x*15)=300
We move all terms to the left:
(x*10)+(x*15)-(300)=0
We add all the numbers together, and all the variables
(+x*10)+(+x*15)-300=0
We get rid of parentheses
x*10+x*15-300=0
Wy multiply elements
10x+15x-300=0
We add all the numbers together, and all the variables
25x-300=0
We move all terms containing x to the left, all other terms to the right
25x=300
x=300/25
x=12
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