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Simplifying -148 = -8r + -7(-4 + 2r) -148 = -8r + (-4 * -7 + 2r * -7) -148 = -8r + (28 + -14r) Reorder the terms: -148 = 28 + -8r + -14r Combine like terms: -8r + -14r = -22r -148 = 28 + -22r Solving -148 = 28 + -22r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '22r' to each side of the equation. -148 + 22r = 28 + -22r + 22r Combine like terms: -22r + 22r = 0 -148 + 22r = 28 + 0 -148 + 22r = 28 Add '148' to each side of the equation. -148 + 148 + 22r = 28 + 148 Combine like terms: -148 + 148 = 0 0 + 22r = 28 + 148 22r = 28 + 148 Combine like terms: 28 + 148 = 176 22r = 176 Divide each side by '22'. r = 8 Simplifying r = 8
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