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Simplifying 7(x + 3) = -4(9 + -4x) + -9x Reorder the terms: 7(3 + x) = -4(9 + -4x) + -9x (3 * 7 + x * 7) = -4(9 + -4x) + -9x (21 + 7x) = -4(9 + -4x) + -9x 21 + 7x = (9 * -4 + -4x * -4) + -9x 21 + 7x = (-36 + 16x) + -9x Combine like terms: 16x + -9x = 7x 21 + 7x = -36 + 7x Add '-7x' to each side of the equation. 21 + 7x + -7x = -36 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + 0 = -36 + 7x + -7x 21 = -36 + 7x + -7x Combine like terms: 7x + -7x = 0 21 = -36 + 0 21 = -36 Solving 21 = -36 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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