Y+6=.8(x+7)

Solution for Y+6=.8(x+7) equation:

Simplifying
Y + 6 = 0.8(x + 7)

Reorder the terms:
6 + Y = 0.8(x + 7)

Reorder the terms:
6 + Y = 0.8(7 + x)
6 + Y = (7 * 0.8 + x * 0.8)
6 + Y = (5.6 + 0.8x)

Solving
6 + Y = 5.6 + 0.8x

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 + Y = 5.6 + -6 + 0.8x

Combine like terms: 6 + -6 = 0
0 + Y = 5.6 + -6 + 0.8x
Y = 5.6 + -6 + 0.8x

Combine like terms: 5.6 + -6 = -0.4
Y = -0.4 + 0.8x

Simplifying
Y = -0.4 + 0.8x