3(90+-13y)+21y=180

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Solution for 3(90+-13y)+21y=180 equation:



3(90+-13y)+21y=180
We move all terms to the left:
3(90+-13y)+21y-(180)=0
We add all the numbers together, and all the variables
3(-13y)+21y-180=0
We add all the numbers together, and all the variables
21y+3(-13y)-180=0
We multiply parentheses
21y-39y-180=0
We add all the numbers together, and all the variables
-18y-180=0
We move all terms containing y to the left, all other terms to the right
-18y=180
y=180/-18
y=-10

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