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Simplifying -21 = -7(x + 10) Reorder the terms: -21 = -7(10 + x) -21 = (10 * -7 + x * -7) -21 = (-70 + -7x) Solving -21 = -70 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. -21 + 7x = -70 + -7x + 7x Combine like terms: -7x + 7x = 0 -21 + 7x = -70 + 0 -21 + 7x = -70 Add '21' to each side of the equation. -21 + 21 + 7x = -70 + 21 Combine like terms: -21 + 21 = 0 0 + 7x = -70 + 21 7x = -70 + 21 Combine like terms: -70 + 21 = -49 7x = -49 Divide each side by '7'. x = -7 Simplifying x = -7
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