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Simplifying -3d + 7 + d = -1(2d + -3) + 4 Reorder the terms: 7 + -3d + d = -1(2d + -3) + 4 Combine like terms: -3d + d = -2d 7 + -2d = -1(2d + -3) + 4 Reorder the terms: 7 + -2d = -1(-3 + 2d) + 4 7 + -2d = (-3 * -1 + 2d * -1) + 4 7 + -2d = (3 + -2d) + 4 Reorder the terms: 7 + -2d = 3 + 4 + -2d Combine like terms: 3 + 4 = 7 7 + -2d = 7 + -2d Add '-7' to each side of the equation. 7 + -7 + -2d = 7 + -7 + -2d Combine like terms: 7 + -7 = 0 0 + -2d = 7 + -7 + -2d -2d = 7 + -7 + -2d Combine like terms: 7 + -7 = 0 -2d = 0 + -2d -2d = -2d Add '2d' to each side of the equation. -2d + 2d = -2d + 2d Combine like terms: -2d + 2d = 0 0 = -2d + 2d Combine like terms: -2d + 2d = 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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