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Simplifying -3(-7x + 7) + -7x = 4(x + -1) + -9 Reorder the terms: -3(7 + -7x) + -7x = 4(x + -1) + -9 (7 * -3 + -7x * -3) + -7x = 4(x + -1) + -9 (-21 + 21x) + -7x = 4(x + -1) + -9 Combine like terms: 21x + -7x = 14x -21 + 14x = 4(x + -1) + -9 Reorder the terms: -21 + 14x = 4(-1 + x) + -9 -21 + 14x = (-1 * 4 + x * 4) + -9 -21 + 14x = (-4 + 4x) + -9 Reorder the terms: -21 + 14x = -4 + -9 + 4x Combine like terms: -4 + -9 = -13 -21 + 14x = -13 + 4x Solving -21 + 14x = -13 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -21 + 14x + -4x = -13 + 4x + -4x Combine like terms: 14x + -4x = 10x -21 + 10x = -13 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 + 10x = -13 + 0 -21 + 10x = -13 Add '21' to each side of the equation. -21 + 21 + 10x = -13 + 21 Combine like terms: -21 + 21 = 0 0 + 10x = -13 + 21 10x = -13 + 21 Combine like terms: -13 + 21 = 8 10x = 8 Divide each side by '10'. x = 0.8 Simplifying x = 0.8
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