-3.9+-3.9+R=-8.5+-3.9

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Solution for -3.9+-3.9+R=-8.5+-3.9 equation: 


Simplifying
-3.9 + -3.9 + R = -8.5 + -3.9

Combine like terms: -3.9 + -3.9 = -7.8
-7.8 + R = -8.5 + -3.9

Combine like terms: -8.5 + -3.9 = -12.4
-7.8 + R = -12.4

Solving
-7.8 + R = -12.4

Solving for variable 'R'.

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

Add '7.8' to each side of the equation.
-7.8 + 7.8 + R = -12.4 + 7.8

Combine like terms: -7.8 + 7.8 = 0.0
0.0 + R = -12.4 + 7.8
R = -12.4 + 7.8

Combine like terms: -12.4 + 7.8 = -4.6
R = -4.6

Simplifying
R = -4.6

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