21x+20-7x=117/3*3-13

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Solution for 21x+20-7x=117/3*3-13 equation: 



21x+20-7x=117/3*3-13

We move all terms to the left:

21x+20-7x-(117/3*3-13)=0

We add all the numbers together, and all the variables

14x+20-(117/3*3-13)=0

We get rid of parentheses

14x+20+13-117/3*3=0

We multiply all the terms by the denominator


14x*3*3-117+20*3*3+13*3*3=0

We add all the numbers together, and all the variables

14x*3*3+180=0

Wy multiply elements

126x*3+180=0

Wy multiply elements

378x+180=0

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

378x=-180

x=-180/378

x=-10/21

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