7(8r+5)-5(r-4)=4

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Solution for 7(8r+5)-5(r-4)=4 equation:


Simplifying
7(8r + 5) + -5(r + -4) = 4

Reorder the terms:
7(5 + 8r) + -5(r + -4) = 4
(5 * 7 + 8r * 7) + -5(r + -4) = 4
(35 + 56r) + -5(r + -4) = 4

Reorder the terms:
35 + 56r + -5(-4 + r) = 4
35 + 56r + (-4 * -5 + r * -5) = 4
35 + 56r + (20 + -5r) = 4

Reorder the terms:
35 + 20 + 56r + -5r = 4

Combine like terms: 35 + 20 = 55
55 + 56r + -5r = 4

Combine like terms: 56r + -5r = 51r
55 + 51r = 4

Solving
55 + 51r = 4

Solving for variable 'r'.

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

Add '-55' to each side of the equation.
55 + -55 + 51r = 4 + -55

Combine like terms: 55 + -55 = 0
0 + 51r = 4 + -55
51r = 4 + -55

Combine like terms: 4 + -55 = -51
51r = -51

Divide each side by '51'.
r = -1

Simplifying
r = -1

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