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Simplifying 3x + -7(4x + 21) = 103 Reorder the terms: 3x + -7(21 + 4x) = 103 3x + (21 * -7 + 4x * -7) = 103 3x + (-147 + -28x) = 103 Reorder the terms: -147 + 3x + -28x = 103 Combine like terms: 3x + -28x = -25x -147 + -25x = 103 Solving -147 + -25x = 103 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '147' to each side of the equation. -147 + 147 + -25x = 103 + 147 Combine like terms: -147 + 147 = 0 0 + -25x = 103 + 147 -25x = 103 + 147 Combine like terms: 103 + 147 = 250 -25x = 250 Divide each side by '-25'. x = -10 Simplifying x = -10
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