15.8=r+1.2*(x-5)

Solution for 15.8=r+1.2*(x-5) equation:

Simplifying
15.8 = r + 1.2(x + -5)

Reorder the terms:
15.8 = r + 1.2(-5 + x)
15.8 = r + (-5 * 1.2 + x * 1.2)
15.8 = r + (-6 + 1.2x)

Reorder the terms:
15.8 = -6 + r + 1.2x

Solving
15.8 = -6 + r + 1.2x

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
15.8 + -1r = -6 + r + -1r + 1.2x

Combine like terms: r + -1r = 0
15.8 + -1r = -6 + 0 + 1.2x
15.8 + -1r = -6 + 1.2x

Add '-15.8' to each side of the equation.
15.8 + -15.8 + -1r = -6 + -15.8 + 1.2x

Combine like terms: 15.8 + -15.8 = 0.0
0.0 + -1r = -6 + -15.8 + 1.2x
-1r = -6 + -15.8 + 1.2x

Combine like terms: -6 + -15.8 = -21.8
-1r = -21.8 + 1.2x

Divide each side by '-1'.
r = 21.8 + -1.2x

Simplifying
r = 21.8 + -1.2x