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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 = 91 -7x = 91 Divide each side by '-7'. x = -13 Simplifying x = -13
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