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Simplifying 2r + 1(-4r) + 7 = 0 Remove parenthesis around (-4r) 2r + 1 * -4r + 7 = 0 Multiply 1 * -4 2r + -4r + 7 = 0 Reorder the terms: 7 + 2r + -4r = 0 Combine like terms: 2r + -4r = -2r 7 + -2r = 0 Solving 7 + -2r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -2r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -2r = 0 + -7 -2r = 0 + -7 Combine like terms: 0 + -7 = -7 -2r = -7 Divide each side by '-2'. r = 3.5 Simplifying r = 3.5
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