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Simplifying -28 = -7(3x + 4x) + 21x Combine like terms: 3x + 4x = 7x -28 = -7(7x) + 21x Remove parenthesis around (7x) -28 = -7 * 7x + 21x Multiply -7 * 7 -28 = -49x + 21x Combine like terms: -49x + 21x = -28x -28 = -28x Solving -28 = -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. -28 + 28x = -28x + 28x Combine like terms: -28x + 28x = 0 -28 + 28x = 0 Add '28' to each side of the equation. -28 + 28 + 28x = 0 + 28 Combine like terms: -28 + 28 = 0 0 + 28x = 0 + 28 28x = 0 + 28 Combine like terms: 0 + 28 = 28 28x = 28 Divide each side by '28'. x = 1 Simplifying x = 1
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