1.8=r-3.9

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Solution for 1.8=r-3.9 equation:


Simplifying
1.8 = r + -3.9

Reorder the terms:
1.8 = -3.9 + r

Solving
1.8 = -3.9 + r

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.
1.8 + -1r = -3.9 + r + -1r

Combine like terms: r + -1r = 0
1.8 + -1r = -3.9 + 0
1.8 + -1r = -3.9

Add '-1.8' to each side of the equation.
1.8 + -1.8 + -1r = -3.9 + -1.8

Combine like terms: 1.8 + -1.8 = 0.0
0.0 + -1r = -3.9 + -1.8
-1r = -3.9 + -1.8

Combine like terms: -3.9 + -1.8 = -5.7
-1r = -5.7

Divide each side by '-1'.
r = 5.7

Simplifying
r = 5.7

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