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Simplifying 21 = -7(-8 + x) 21 = (-8 * -7 + x * -7) 21 = (56 + -7x) Solving 21 = 56 + -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 = 56 + -7x + 7x Combine like terms: -7x + 7x = 0 21 + 7x = 56 + 0 21 + 7x = 56 Add '-21' to each side of the equation. 21 + -21 + 7x = 56 + -21 Combine like terms: 21 + -21 = 0 0 + 7x = 56 + -21 7x = 56 + -21 Combine like terms: 56 + -21 = 35 7x = 35 Divide each side by '7'. x = 5 Simplifying x = 5
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