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Simplifying 7r * 2 = (r + -4) Reorder the terms for easier multiplication: 7 * 2r = (r + -4) Multiply 7 * 2 14r = (r + -4) Reorder the terms: 14r = (-4 + r) Remove parenthesis around (-4 + r) 14r = -4 + r Solving 14r = -4 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 14r + -1r = -4 + r + -1r Combine like terms: 14r + -1r = 13r 13r = -4 + r + -1r Combine like terms: r + -1r = 0 13r = -4 + 0 13r = -4 Divide each side by '13'. r = -0.3076923077 Simplifying r = -0.3076923077
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