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Simplifying 2r + 1 + (-4r) + 7 = (2 + -4) * r + 1 + 7 Reorder the terms: 1 + 7 + 2r + (-4r) = (2 + -4) * r + 1 + 7 Combine like terms: 1 + 7 = 8 8 + 2r + (-4r) = (2 + -4) * r + 1 + 7 Combine like terms: 2r + (-4r) = -2r 8 + -2r = (2 + -4) * r + 1 + 7 Combine like terms: 2 + -4 = -2 8 + -2r = (-2) * r + 1 + 7 Reorder the terms: 8 + -2r = 1 + 7 + -2r Combine like terms: 1 + 7 = 8 8 + -2r = 8 + -2r Add '-8' to each side of the equation. 8 + -8 + -2r = 8 + -8 + -2r Combine like terms: 8 + -8 = 0 0 + -2r = 8 + -8 + -2r -2r = 8 + -8 + -2r Combine like terms: 8 + -8 = 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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