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Simplifying 21 + -15 = 2(x + -4) Combine like terms: 21 + -15 = 6 6 = 2(x + -4) Reorder the terms: 6 = 2(-4 + x) 6 = (-4 * 2 + x * 2) 6 = (-8 + 2x) Solving 6 = -8 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 6 + -2x = -8 + 2x + -2x Combine like terms: 2x + -2x = 0 6 + -2x = -8 + 0 6 + -2x = -8 Add '-6' to each side of the equation. 6 + -6 + -2x = -8 + -6 Combine like terms: 6 + -6 = 0 0 + -2x = -8 + -6 -2x = -8 + -6 Combine like terms: -8 + -6 = -14 -2x = -14 Divide each side by '-2'. x = 7 Simplifying x = 7
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