-3.5r+8.5-7r=-18.5

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Solution for -3.5r+8.5-7r=-18.5 equation: 


Simplifying
-3.5r + 8.5 + -7r = -18.5

Reorder the terms:
8.5 + -3.5r + -7r = -18.5

Combine like terms: -3.5r + -7r = -10.5r
8.5 + -10.5r = -18.5

Solving
8.5 + -10.5r = -18.5

Solving for variable 'r'.

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

Add '-8.5' to each side of the equation.
8.5 + -8.5 + -10.5r = -18.5 + -8.5

Combine like terms: 8.5 + -8.5 = 0.0
0.0 + -10.5r = -18.5 + -8.5
-10.5r = -18.5 + -8.5

Combine like terms: -18.5 + -8.5 = -27
-10.5r = -27

Divide each side by '-10.5'.
r = 2.571428571

Simplifying
r = 2.571428571

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