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Simplifying -6(2 + 5r) + 7 = -155 (2 * -6 + 5r * -6) + 7 = -155 (-12 + -30r) + 7 = -155 Reorder the terms: -12 + 7 + -30r = -155 Combine like terms: -12 + 7 = -5 -5 + -30r = -155 Solving -5 + -30r = -155 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -30r = -155 + 5 Combine like terms: -5 + 5 = 0 0 + -30r = -155 + 5 -30r = -155 + 5 Combine like terms: -155 + 5 = -150 -30r = -150 Divide each side by '-30'. r = 5 Simplifying r = 5
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