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Simplifying 27 + -1r = 4(-3 + -7) Combine like terms: -3 + -7 = -10 27 + -1r = 4(-10) Multiply 4 * -10 27 + -1r = -40 Solving 27 + -1r = -40 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + -1r = -40 + -27 Combine like terms: 27 + -27 = 0 0 + -1r = -40 + -27 -1r = -40 + -27 Combine like terms: -40 + -27 = -67 -1r = -67 Divide each side by '-1'. r = 67 Simplifying r = 67
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