-2r+5=7(3r+4)

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Solution for -2r+5=7(3r+4) equation:


Simplifying
-2r + 5 = 7(3r + 4)

Reorder the terms:
5 + -2r = 7(3r + 4)

Reorder the terms:
5 + -2r = 7(4 + 3r)
5 + -2r = (4 * 7 + 3r * 7)
5 + -2r = (28 + 21r)

Solving
5 + -2r = 28 + 21r

Solving for variable 'r'.

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

Add '-21r' to each side of the equation.
5 + -2r + -21r = 28 + 21r + -21r

Combine like terms: -2r + -21r = -23r
5 + -23r = 28 + 21r + -21r

Combine like terms: 21r + -21r = 0
5 + -23r = 28 + 0
5 + -23r = 28

Add '-5' to each side of the equation.
5 + -5 + -23r = 28 + -5

Combine like terms: 5 + -5 = 0
0 + -23r = 28 + -5
-23r = 28 + -5

Combine like terms: 28 + -5 = 23
-23r = 23

Divide each side by '-23'.
r = -1

Simplifying
r = -1

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