a+(-1)(10-a)=30

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Solution for a+(-1)(10-a)=30 equation: 



a+(-1)(10-a)=30

We move all terms to the left:

a+(-1)(10-a)-(30)=0

We add all the numbers together, and all the variables

a+(-1)(-1a+10)-30=0

We multiply parentheses ..

a+(+a-10)-30=0

We add all the numbers together, and all the variables

a+(a-10)-30=0

We get rid of parentheses

a+a-10-30=0

We add all the numbers together, and all the variables

2a-40=0

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

2a=40

a=40/2

a=20

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