4.2(y+8)=10.5

Solution for 4.2(y+8)=10.5 equation:

Simplifying
4.2(y + 8) = 10.5

Reorder the terms:
4.2(8 + y) = 10.5
(8 * 4.2 + y * 4.2) = 10.5
(33.6 + 4.2y) = 10.5

Solving
33.6 + 4.2y = 10.5

Solving for variable 'y'.

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

Add '-33.6' to each side of the equation.
33.6 + -33.6 + 4.2y = 10.5 + -33.6

Combine like terms: 33.6 + -33.6 = 0.0
0.0 + 4.2y = 10.5 + -33.6
4.2y = 10.5 + -33.6

Combine like terms: 10.5 + -33.6 = -23.1
4.2y = -23.1

Divide each side by '4.2'.
y = -5.5

Simplifying
y = -5.5