Question

7(90-x)-3(180-x)=30​

Answer 1

The answer is x=15.

Explanation:

1. You distributive

( You would multiply (7 times 90= 630), (7 times x= 7x) + (-3 times 180= -540), (-3 times x= -3x)= 30

2. Combine like terms

3. Solve

(I'm sorry if you don't get it)

Answer 2

180-x=3(90-x)+30

We move all terms to the left:

180-x-(3(90-x)+30)=0

We add all the numbers together, and all the variables

-x-(3(-1x+90)+30)+180=0

We add all the numbers together, and all the variables

-1x-(3(-1x+90)+30)+180=0


We calculate terms in parentheses: -(3(-1x+90)+30), so:

3(-1x+90)+30

We multiply parentheses

-3x+270+30

We add all the numbers together, and all the variables

-3x+300

Back to the equation:

-(-3x+300)


We get rid of parentheses

-1x+3x-300+180=0

We add all the numbers together, and all the variables

2x-120=0

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

2x=120

x=120/2

x=60


So sorry if it’s wrong I tried