310=2r+2(45)

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Solution for 310=2r+2(45) equation: 


Simplifying
310 = 2r + 2(45)

Multiply 2 * 45
310 = 2r + 90

Reorder the terms:
310 = 90 + 2r

Solving
310 = 90 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
310 + -2r = 90 + 2r + -2r

Combine like terms: 2r + -2r = 0
310 + -2r = 90 + 0
310 + -2r = 90

Add '-310' to each side of the equation.
310 + -310 + -2r = 90 + -310

Combine like terms: 310 + -310 = 0
0 + -2r = 90 + -310
-2r = 90 + -310

Combine like terms: 90 + -310 = -220
-2r = -220

Divide each side by '-2'.
r = 110

Simplifying
r = 110

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