-3r-0.7+4.2r-2.1r=

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Solution for -3r-0.7+4.2r-2.1r= equation: 


Simplifying
-3r + -0.7 + 4.2r + -2.1r = 0

Reorder the terms:
-0.7 + -3r + 4.2r + -2.1r = 0

Combine like terms: -3r + 4.2r = 1.2r
-0.7 + 1.2r + -2.1r = 0

Combine like terms: 1.2r + -2.1r = -0.9r
-0.7 + -0.9r = 0

Solving
-0.7 + -0.9r = 0

Solving for variable 'r'.

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

Add '0.7' to each side of the equation.
-0.7 + 0.7 + -0.9r = 0 + 0.7

Combine like terms: -0.7 + 0.7 = 0.0
0.0 + -0.9r = 0 + 0.7
-0.9r = 0 + 0.7

Combine like terms: 0 + 0.7 = 0.7
-0.9r = 0.7

Divide each side by '-0.9'.
r = -0.7777777778

Simplifying
r = -0.7777777778

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