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Simplifying -21 + 7x = 10(x + -1) Reorder the terms: -21 + 7x = 10(-1 + x) -21 + 7x = (-1 * 10 + x * 10) -21 + 7x = (-10 + 10x) Solving -21 + 7x = -10 + 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 + 7x + -10x = -10 + 10x + -10x Combine like terms: 7x + -10x = -3x -21 + -3x = -10 + 10x + -10x Combine like terms: 10x + -10x = 0 -21 + -3x = -10 + 0 -21 + -3x = -10 Add '21' to each side of the equation. -21 + 21 + -3x = -10 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = -10 + 21 -3x = -10 + 21 Combine like terms: -10 + 21 = 11 -3x = 11 Divide each side by '-3'. x = -3.666666667 Simplifying x = -3.666666667
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