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Simplifying 21 + -13 = 4(x + -7) Combine like terms: 21 + -13 = 8 8 = 4(x + -7) Reorder the terms: 8 = 4(-7 + x) 8 = (-7 * 4 + x * 4) 8 = (-28 + 4x) Solving 8 = -28 + 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. 8 + -4x = -28 + 4x + -4x Combine like terms: 4x + -4x = 0 8 + -4x = -28 + 0 8 + -4x = -28 Add '-8' to each side of the equation. 8 + -8 + -4x = -28 + -8 Combine like terms: 8 + -8 = 0 0 + -4x = -28 + -8 -4x = -28 + -8 Combine like terms: -28 + -8 = -36 -4x = -36 Divide each side by '-4'. x = 9 Simplifying x = 9
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