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Simplifying 7x(x + -3) = 7x2 + -21x Reorder the terms: 7x(-3 + x) = 7x2 + -21x (-3 * 7x + x * 7x) = 7x2 + -21x (-21x + 7x2) = 7x2 + -21x Reorder the terms: -21x + 7x2 = -21x + 7x2 Add '21x' to each side of the equation. -21x + 21x + 7x2 = -21x + 21x + 7x2 Combine like terms: -21x + 21x = 0 0 + 7x2 = -21x + 21x + 7x2 7x2 = -21x + 21x + 7x2 Combine like terms: -21x + 21x = 0 7x2 = 0 + 7x2 7x2 = 7x2 Add '-7x2' to each side of the equation. 7x2 + -7x2 = 7x2 + -7x2 Combine like terms: 7x2 + -7x2 = 0 0 = 7x2 + -7x2 Combine like terms: 7x2 + -7x2 = 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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