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Simplifying -13d + -21 = -3(d + -7) + -10d Reorder the terms: -21 + -13d = -3(d + -7) + -10d Reorder the terms: -21 + -13d = -3(-7 + d) + -10d -21 + -13d = (-7 * -3 + d * -3) + -10d -21 + -13d = (21 + -3d) + -10d Combine like terms: -3d + -10d = -13d -21 + -13d = 21 + -13d Add '13d' to each side of the equation. -21 + -13d + 13d = 21 + -13d + 13d Combine like terms: -13d + 13d = 0 -21 + 0 = 21 + -13d + 13d -21 = 21 + -13d + 13d Combine like terms: -13d + 13d = 0 -21 = 21 + 0 -21 = 21 Solving -21 = 21 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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