(3y-1)+(4y+7)=90

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Solution for (3y-1)+(4y+7)=90 equation:


Simplifying
(3y + -1) + (4y + 7) = 90

Reorder the terms:
(-1 + 3y) + (4y + 7) = 90

Remove parenthesis around (-1 + 3y)
-1 + 3y + (4y + 7) = 90

Reorder the terms:
-1 + 3y + (7 + 4y) = 90

Remove parenthesis around (7 + 4y)
-1 + 3y + 7 + 4y = 90

Reorder the terms:
-1 + 7 + 3y + 4y = 90

Combine like terms: -1 + 7 = 6
6 + 3y + 4y = 90

Combine like terms: 3y + 4y = 7y
6 + 7y = 90

Solving
6 + 7y = 90

Solving for variable 'y'.

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

Add '-6' to each side of the equation.
6 + -6 + 7y = 90 + -6

Combine like terms: 6 + -6 = 0
0 + 7y = 90 + -6
7y = 90 + -6

Combine like terms: 90 + -6 = 84
7y = 84

Divide each side by '7'.
y = 12

Simplifying
y = 12

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