3(90-x)-1=7(90-x)+1

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Solution for 3(90-x)-1=7(90-x)+1 equation: 



3(90-x)-1=7(90-x)+1

We move all terms to the left:

3(90-x)-1-(7(90-x)+1)=0

We add all the numbers together, and all the variables

3(-1x+90)-(7(-1x+90)+1)-1=0

We multiply parentheses

-3x-(7(-1x+90)+1)+270-1=0



We calculate terms in parentheses: -(7(-1x+90)+1), so:

7(-1x+90)+1

We multiply parentheses

-7x+630+1

We add all the numbers together, and all the variables

-7x+631

Back to the equation:

-(-7x+631)



We add all the numbers together, and all the variables

-3x-(-7x+631)+269=0

We get rid of parentheses

-3x+7x-631+269=0

We add all the numbers together, and all the variables

4x-362=0

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

4x=362

x=362/4

x=90+1/2

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