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