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Simplifying -21 = -7(3 + 4x) -21 = (3 * -7 + 4x * -7) -21 = (-21 + -28x) Add '21' to each side of the equation. -21 + 21 = -21 + 21 + -28x Combine like terms: -21 + 21 = 0 0 = -21 + 21 + -28x Combine like terms: -21 + 21 = 0 0 = 0 + -28x 0 = -28x Solving 0 = -28x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28x' to each side of the equation. 0 + 28x = -28x + 28x Remove the zero: 28x = -28x + 28x Combine like terms: -28x + 28x = 0 28x = 0 Divide each side by '28'. x = 0 Simplifying x = 0
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