1-7(r+7)=-90

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Solution for 1-7(r+7)=-90 equation: 


Simplifying
1 + -7(r + 7) = -90

Reorder the terms:
1 + -7(7 + r) = -90
1 + (7 * -7 + r * -7) = -90
1 + (-49 + -7r) = -90

Combine like terms: 1 + -49 = -48
-48 + -7r = -90

Solving
-48 + -7r = -90

Solving for variable 'r'.

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

Add '48' to each side of the equation.
-48 + 48 + -7r = -90 + 48

Combine like terms: -48 + 48 = 0
0 + -7r = -90 + 48
-7r = -90 + 48

Combine like terms: -90 + 48 = -42
-7r = -42

Divide each side by '-7'.
r = 6

Simplifying
r = 6

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