(x*12)+(2x*10.50)+(3x*4)=15

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Solution for (x*12)+(2x*10.50)+(3x*4)=15 equation: 



(x*12)+(2x*10.50)+(3x*4)=15

We move all terms to the left:

(x*12)+(2x*10.50)+(3x*4)-(15)=0

We add all the numbers together, and all the variables

(+x*12)+(+2x*10.50)+(+3x*4)-15=0

We get rid of parentheses

x*12+2x*10.50+3x*4-15=0

Wy multiply elements

12x+21x+12x-15=0

We add all the numbers together, and all the variables

45x-15=0

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

45x=15

x=15/45

x=1/3

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