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Simplifying 4 + x + 7 = 3x + 21 Reorder the terms: 4 + 7 + x = 3x + 21 Combine like terms: 4 + 7 = 11 11 + x = 3x + 21 Reorder the terms: 11 + x = 21 + 3x Solving 11 + x = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 11 + x + -3x = 21 + 3x + -3x Combine like terms: x + -3x = -2x 11 + -2x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 11 + -2x = 21 + 0 11 + -2x = 21 Add '-11' to each side of the equation. 11 + -11 + -2x = 21 + -11 Combine like terms: 11 + -11 = 0 0 + -2x = 21 + -11 -2x = 21 + -11 Combine like terms: 21 + -11 = 10 -2x = 10 Divide each side by '-2'. x = -5 Simplifying x = -5
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