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