3(4r+5)-4(r+5)=

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Solution for 3(4r+5)-4(r+5)= equation:


Simplifying
3(4r + 5) + -4(r + 5) = 0

Reorder the terms:
3(5 + 4r) + -4(r + 5) = 0
(5 * 3 + 4r * 3) + -4(r + 5) = 0
(15 + 12r) + -4(r + 5) = 0

Reorder the terms:
15 + 12r + -4(5 + r) = 0
15 + 12r + (5 * -4 + r * -4) = 0
15 + 12r + (-20 + -4r) = 0

Reorder the terms:
15 + -20 + 12r + -4r = 0

Combine like terms: 15 + -20 = -5
-5 + 12r + -4r = 0

Combine like terms: 12r + -4r = 8r
-5 + 8r = 0

Solving
-5 + 8r = 0

Solving for variable 'r'.

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

Add '5' to each side of the equation.
-5 + 5 + 8r = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 8r = 0 + 5
8r = 0 + 5

Combine like terms: 0 + 5 = 5
8r = 5

Divide each side by '8'.
r = 0.625

Simplifying
r = 0.625

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