-9(5r+7)+9(-5r+8)=

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Solution for -9(5r+7)+9(-5r+8)= equation:


Simplifying
-9(5r + 7) + 9(-5r + 8) = 0

Reorder the terms:
-9(7 + 5r) + 9(-5r + 8) = 0
(7 * -9 + 5r * -9) + 9(-5r + 8) = 0
(-63 + -45r) + 9(-5r + 8) = 0

Reorder the terms:
-63 + -45r + 9(8 + -5r) = 0
-63 + -45r + (8 * 9 + -5r * 9) = 0
-63 + -45r + (72 + -45r) = 0

Reorder the terms:
-63 + 72 + -45r + -45r = 0

Combine like terms: -63 + 72 = 9
9 + -45r + -45r = 0

Combine like terms: -45r + -45r = -90r
9 + -90r = 0

Solving
9 + -90r = 0

Solving for variable 'r'.

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

Add '-9' to each side of the equation.
9 + -9 + -90r = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -90r = 0 + -9
-90r = 0 + -9

Combine like terms: 0 + -9 = -9
-90r = -9

Divide each side by '-90'.
r = 0.1

Simplifying
r = 0.1

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