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Simplifying -21 + 20 + -12 + -3 + 3x + -1(-5x) + -7x = 0 Remove parenthesis around (-5x) -21 + 20 + -12 + -3 + 3x + -1 * -5x + -7x = 0 Multiply -1 * -5 -21 + 20 + -12 + -3 + 3x + 5x + -7x = 0 Combine like terms: -21 + 20 = -1 -1 + -12 + -3 + 3x + 5x + -7x = 0 Combine like terms: -1 + -12 = -13 -13 + -3 + 3x + 5x + -7x = 0 Combine like terms: -13 + -3 = -16 -16 + 3x + 5x + -7x = 0 Combine like terms: 3x + 5x = 8x -16 + 8x + -7x = 0 Combine like terms: 8x + -7x = 1x -16 + 1x = 0 Solving -16 + 1x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + 1x = 0 + 16 Combine like terms: -16 + 16 = 0 0 + 1x = 0 + 16 1x = 0 + 16 Combine like terms: 0 + 16 = 16 1x = 16 Divide each side by '1'. x = 16 Simplifying x = 16
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