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Simplifying -9x + -21 = 10x + 7 Reorder the terms: -21 + -9x = 10x + 7 Reorder the terms: -21 + -9x = 7 + 10x Solving -21 + -9x = 7 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. -21 + -9x + -10x = 7 + 10x + -10x Combine like terms: -9x + -10x = -19x -21 + -19x = 7 + 10x + -10x Combine like terms: 10x + -10x = 0 -21 + -19x = 7 + 0 -21 + -19x = 7 Add '21' to each side of the equation. -21 + 21 + -19x = 7 + 21 Combine like terms: -21 + 21 = 0 0 + -19x = 7 + 21 -19x = 7 + 21 Combine like terms: 7 + 21 = 28 -19x = 28 Divide each side by '-19'. x = -1.473684211 Simplifying x = -1.473684211
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