8=4.2r-7+1.8

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Solution for 8=4.2r-7+1.8 equation: 


Simplifying
8 = 4.2r + -7 + 1.8

Reorder the terms:
8 = -7 + 1.8 + 4.2r

Combine like terms: -7 + 1.8 = -5.2
8 = -5.2 + 4.2r

Solving
8 = -5.2 + 4.2r

Solving for variable 'r'.

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

Add '-4.2r' to each side of the equation.
8 + -4.2r = -5.2 + 4.2r + -4.2r

Combine like terms: 4.2r + -4.2r = 0.0
8 + -4.2r = -5.2 + 0.0
8 + -4.2r = -5.2

Add '-8' to each side of the equation.
8 + -8 + -4.2r = -5.2 + -8

Combine like terms: 8 + -8 = 0
0 + -4.2r = -5.2 + -8
-4.2r = -5.2 + -8

Combine like terms: -5.2 + -8 = -13.2
-4.2r = -13.2

Divide each side by '-4.2'.
r = 3.142857143

Simplifying
r = 3.142857143

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