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

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


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

Reorder the terms:
7r + 5(-3 + r) = 8(r + 3) + -3
7r + (-3 * 5 + r * 5) = 8(r + 3) + -3
7r + (-15 + 5r) = 8(r + 3) + -3

Reorder the terms:
-15 + 7r + 5r = 8(r + 3) + -3

Combine like terms: 7r + 5r = 12r
-15 + 12r = 8(r + 3) + -3

Reorder the terms:
-15 + 12r = 8(3 + r) + -3
-15 + 12r = (3 * 8 + r * 8) + -3
-15 + 12r = (24 + 8r) + -3

Reorder the terms:
-15 + 12r = 24 + -3 + 8r

Combine like terms: 24 + -3 = 21
-15 + 12r = 21 + 8r

Solving
-15 + 12r = 21 + 8r

Solving for variable 'r'.

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

Add '-8r' to each side of the equation.
-15 + 12r + -8r = 21 + 8r + -8r

Combine like terms: 12r + -8r = 4r
-15 + 4r = 21 + 8r + -8r

Combine like terms: 8r + -8r = 0
-15 + 4r = 21 + 0
-15 + 4r = 21

Add '15' to each side of the equation.
-15 + 15 + 4r = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 4r = 21 + 15
4r = 21 + 15

Combine like terms: 21 + 15 = 36
4r = 36

Divide each side by '4'.
r = 9

Simplifying
r = 9

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