130-40=65+r

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Solution for 130-40=65+r equation:


Simplifying
130 + -40 = 65 + r

Combine like terms: 130 + -40 = 90
90 = 65 + r

Solving
90 = 65 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
90 + -1r = 65 + r + -1r

Combine like terms: r + -1r = 0
90 + -1r = 65 + 0
90 + -1r = 65

Add '-90' to each side of the equation.
90 + -90 + -1r = 65 + -90

Combine like terms: 90 + -90 = 0
0 + -1r = 65 + -90
-1r = 65 + -90

Combine like terms: 65 + -90 = -25
-1r = -25

Divide each side by '-1'.
r = 25

Simplifying
r = 25

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