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Simplifying -21 + 7x = 4(1 + 3x) -21 + 7x = (1 * 4 + 3x * 4) -21 + 7x = (4 + 12x) Solving -21 + 7x = 4 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. -21 + 7x + -12x = 4 + 12x + -12x Combine like terms: 7x + -12x = -5x -21 + -5x = 4 + 12x + -12x Combine like terms: 12x + -12x = 0 -21 + -5x = 4 + 0 -21 + -5x = 4 Add '21' to each side of the equation. -21 + 21 + -5x = 4 + 21 Combine like terms: -21 + 21 = 0 0 + -5x = 4 + 21 -5x = 4 + 21 Combine like terms: 4 + 21 = 25 -5x = 25 Divide each side by '-5'. x = -5 Simplifying x = -5
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