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Simplifying 7 + -3r = r + -4(2r + r) Combine like terms: 2r + r = 3r 7 + -3r = r + -4(3r) Remove parenthesis around (3r) 7 + -3r = r + -4 * 3r Multiply -4 * 3 7 + -3r = r + -12r Combine like terms: r + -12r = -11r 7 + -3r = -11r Solving 7 + -3r = -11r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '11r' to each side of the equation. 7 + -3r + 11r = -11r + 11r Combine like terms: -3r + 11r = 8r 7 + 8r = -11r + 11r Combine like terms: -11r + 11r = 0 7 + 8r = 0 Add '-7' to each side of the equation. 7 + -7 + 8r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 8r = 0 + -7 8r = 0 + -7 Combine like terms: 0 + -7 = -7 8r = -7 Divide each side by '8'. r = -0.875 Simplifying r = -0.875
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