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Simplifying 7 + 2r + -4r = 7 + -2r Combine like terms: 2r + -4r = -2r 7 + -2r = 7 + -2r Add '-7' to each side of the equation. 7 + -7 + -2r = 7 + -7 + -2r Combine like terms: 7 + -7 = 0 0 + -2r = 7 + -7 + -2r -2r = 7 + -7 + -2r Combine like terms: 7 + -7 = 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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