4.2r-7+1.8r=8

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


Simplifying
4.2r + -7 + 1.8r = 8

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

Combine like terms: 4.2r + 1.8r = 6r
-7 + 6r = 8

Solving
-7 + 6r = 8

Solving for variable 'r'.

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

Add '7' to each side of the equation.
-7 + 7 + 6r = 8 + 7

Combine like terms: -7 + 7 = 0
0 + 6r = 8 + 7
6r = 8 + 7

Combine like terms: 8 + 7 = 15
6r = 15

Divide each side by '6'.
r = 2.5

Simplifying
r = 2.5

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