(-7*28)+(-7*75)=-7(28+r)

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Solution for (-7*28)+(-7*75)=-7(28+r) equation:


Simplifying
(-7 * 28) + (-7 * 75) = -7(28 + r)

Multiply -7 * 28
(-196) + (-7 * 75) = -7(28 + r)
-196 + (-7 * 75) = -7(28 + r)

Multiply -7 * 75
-196 + (-525) = -7(28 + r)
-196 + -525 = -7(28 + r)

Combine like terms: -196 + -525 = -721
-721 = -7(28 + r)
-721 = (28 * -7 + r * -7)
-721 = (-196 + -7r)

Solving
-721 = -196 + -7r

Solving for variable 'r'.

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

Add '7r' to each side of the equation.
-721 + 7r = -196 + -7r + 7r

Combine like terms: -7r + 7r = 0
-721 + 7r = -196 + 0
-721 + 7r = -196

Add '721' to each side of the equation.
-721 + 721 + 7r = -196 + 721

Combine like terms: -721 + 721 = 0
0 + 7r = -196 + 721
7r = -196 + 721

Combine like terms: -196 + 721 = 525
7r = 525

Divide each side by '7'.
r = 75

Simplifying
r = 75

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