-3y+10+7y=20

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Solution for -3y+10+7y=20 equation: 


Simplifying
-3y + 10 + 7y = 20

Reorder the terms:
10 + -3y + 7y = 20

Combine like terms: -3y + 7y = 4y
10 + 4y = 20

Solving
10 + 4y = 20

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-10' to each side of the equation.
10 + -10 + 4y = 20 + -10

Combine like terms: 10 + -10 = 0
0 + 4y = 20 + -10
4y = 20 + -10

Combine like terms: 20 + -10 = 10
4y = 10

Divide each side by '4'.
y = 2.5

Simplifying
y = 2.5

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