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Simplifying (x + 1) + (x + 3) = 2(x + 3) + -2 Reorder the terms: (1 + x) + (x + 3) = 2(x + 3) + -2 Remove parenthesis around (1 + x) 1 + x + (x + 3) = 2(x + 3) + -2 Reorder the terms: 1 + x + (3 + x) = 2(x + 3) + -2 Remove parenthesis around (3 + x) 1 + x + 3 + x = 2(x + 3) + -2 Reorder the terms: 1 + 3 + x + x = 2(x + 3) + -2 Combine like terms: 1 + 3 = 4 4 + x + x = 2(x + 3) + -2 Combine like terms: x + x = 2x 4 + 2x = 2(x + 3) + -2 Reorder the terms: 4 + 2x = 2(3 + x) + -2 4 + 2x = (3 * 2 + x * 2) + -2 4 + 2x = (6 + 2x) + -2 Reorder the terms: 4 + 2x = 6 + -2 + 2x Combine like terms: 6 + -2 = 4 4 + 2x = 4 + 2x Add '-4' to each side of the equation. 4 + -4 + 2x = 4 + -4 + 2x Combine like terms: 4 + -4 = 0 0 + 2x = 4 + -4 + 2x 2x = 4 + -4 + 2x Combine like terms: 4 + -4 = 0 2x = 0 + 2x 2x = 2x Add '-2x' to each side of the equation. 2x + -2x = 2x + -2x Combine like terms: 2x + -2x = 0 0 = 2x + -2x Combine like terms: 2x + -2x = 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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