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

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


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

Reorder the terms:
-1 = 3(-7 + y) + 7y
-1 = (-7 * 3 + y * 3) + 7y
-1 = (-21 + 3y) + 7y

Combine like terms: 3y + 7y = 10y
-1 = -21 + 10y

Solving
-1 = -21 + 10y

Solving for variable 'y'.

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

Add '-10y' to each side of the equation.
-1 + -10y = -21 + 10y + -10y

Combine like terms: 10y + -10y = 0
-1 + -10y = -21 + 0
-1 + -10y = -21

Add '1' to each side of the equation.
-1 + 1 + -10y = -21 + 1

Combine like terms: -1 + 1 = 0
0 + -10y = -21 + 1
-10y = -21 + 1

Combine like terms: -21 + 1 = -20
-10y = -20

Divide each side by '-10'.
y = 2

Simplifying
y = 2

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