5r+3(r-7)=-(r+8)

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Solution for 5r+3(r-7)=-(r+8) equation:


Simplifying
5r + 3(r + -7) = -1(r + 8)

Reorder the terms:
5r + 3(-7 + r) = -1(r + 8)
5r + (-7 * 3 + r * 3) = -1(r + 8)
5r + (-21 + 3r) = -1(r + 8)

Reorder the terms:
-21 + 5r + 3r = -1(r + 8)

Combine like terms: 5r + 3r = 8r
-21 + 8r = -1(r + 8)

Reorder the terms:
-21 + 8r = -1(8 + r)
-21 + 8r = (8 * -1 + r * -1)
-21 + 8r = (-8 + -1r)

Solving
-21 + 8r = -8 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
-21 + 8r + r = -8 + -1r + r

Combine like terms: 8r + r = 9r
-21 + 9r = -8 + -1r + r

Combine like terms: -1r + r = 0
-21 + 9r = -8 + 0
-21 + 9r = -8

Add '21' to each side of the equation.
-21 + 21 + 9r = -8 + 21

Combine like terms: -21 + 21 = 0
0 + 9r = -8 + 21
9r = -8 + 21

Combine like terms: -8 + 21 = 13
9r = 13

Divide each side by '9'.
r = 1.444444444

Simplifying
r = 1.444444444

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