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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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