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Simplifying 30 = x + (x + -4) Reorder the terms: 30 = x + (-4 + x) Remove parenthesis around (-4 + x) 30 = x + -4 + x Reorder the terms: 30 = -4 + x + x Combine like terms: x + x = 2x 30 = -4 + 2x Solving 30 = -4 + 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. 30 + -2x = -4 + 2x + -2x Combine like terms: 2x + -2x = 0 30 + -2x = -4 + 0 30 + -2x = -4 Add '-30' to each side of the equation. 30 + -30 + -2x = -4 + -30 Combine like terms: 30 + -30 = 0 0 + -2x = -4 + -30 -2x = -4 + -30 Combine like terms: -4 + -30 = -34 -2x = -34 Divide each side by '-2'. x = 17 Simplifying x = 17
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