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Simplifying -2(3r + -3) + 4 = 10 + 7r Reorder the terms: -2(-3 + 3r) + 4 = 10 + 7r (-3 * -2 + 3r * -2) + 4 = 10 + 7r (6 + -6r) + 4 = 10 + 7r Reorder the terms: 6 + 4 + -6r = 10 + 7r Combine like terms: 6 + 4 = 10 10 + -6r = 10 + 7r Add '-10' to each side of the equation. 10 + -10 + -6r = 10 + -10 + 7r Combine like terms: 10 + -10 = 0 0 + -6r = 10 + -10 + 7r -6r = 10 + -10 + 7r Combine like terms: 10 + -10 = 0 -6r = 0 + 7r -6r = 7r Solving -6r = 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. -6r + -7r = 7r + -7r Combine like terms: -6r + -7r = -13r -13r = 7r + -7r Combine like terms: 7r + -7r = 0 -13r = 0 Divide each side by '-13'. r = 0 Simplifying r = 0
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