r+(4.21)=-1

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Solution for r+(4.21)=-1 equation: 


Simplifying
r + (4.21) = -1
r + 4.21 = -1

Reorder the terms:
4.21 + r = -1

Solving
4.21 + r = -1

Solving for variable 'r'.

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

Add '-4.21' to each side of the equation.
4.21 + -4.21 + r = -1 + -4.21

Combine like terms: 4.21 + -4.21 = 0.00
0.00 + r = -1 + -4.21
r = -1 + -4.21

Combine like terms: -1 + -4.21 = -5.21
r = -5.21

Simplifying
r = -5.21

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