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Simplifying 3(r + 4) + -1r = 2r + 12 Reorder the terms: 3(4 + r) + -1r = 2r + 12 (4 * 3 + r * 3) + -1r = 2r + 12 (12 + 3r) + -1r = 2r + 12 Combine like terms: 3r + -1r = 2r 12 + 2r = 2r + 12 Reorder the terms: 12 + 2r = 12 + 2r Add '-12' to each side of the equation. 12 + -12 + 2r = 12 + -12 + 2r Combine like terms: 12 + -12 = 0 0 + 2r = 12 + -12 + 2r 2r = 12 + -12 + 2r Combine like terms: 12 + -12 = 0 2r = 0 + 2r 2r = 2r Add '-2r' to each side of the equation. 2r + -2r = 2r + -2r Combine like terms: 2r + -2r = 0 0 = 2r + -2r Combine like terms: 2r + -2r = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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