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Simplifying 7(x + -3) + 2x = 9(x + 3) + -48 Reorder the terms: 7(-3 + x) + 2x = 9(x + 3) + -48 (-3 * 7 + x * 7) + 2x = 9(x + 3) + -48 (-21 + 7x) + 2x = 9(x + 3) + -48 Combine like terms: 7x + 2x = 9x -21 + 9x = 9(x + 3) + -48 Reorder the terms: -21 + 9x = 9(3 + x) + -48 -21 + 9x = (3 * 9 + x * 9) + -48 -21 + 9x = (27 + 9x) + -48 Reorder the terms: -21 + 9x = 27 + -48 + 9x Combine like terms: 27 + -48 = -21 -21 + 9x = -21 + 9x Add '21' to each side of the equation. -21 + 21 + 9x = -21 + 21 + 9x Combine like terms: -21 + 21 = 0 0 + 9x = -21 + 21 + 9x 9x = -21 + 21 + 9x Combine like terms: -21 + 21 = 0 9x = 0 + 9x 9x = 9x Add '-9x' to each side of the equation. 9x + -9x = 9x + -9x Combine like terms: 9x + -9x = 0 0 = 9x + -9x Combine like terms: 9x + -9x = 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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