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Simplifying 400 = x + -10 + x Reorder the terms: 400 = -10 + x + x Combine like terms: x + x = 2x 400 = -10 + 2x Solving 400 = -10 + 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. 400 + -2x = -10 + 2x + -2x Combine like terms: 2x + -2x = 0 400 + -2x = -10 + 0 400 + -2x = -10 Add '-400' to each side of the equation. 400 + -400 + -2x = -10 + -400 Combine like terms: 400 + -400 = 0 0 + -2x = -10 + -400 -2x = -10 + -400 Combine like terms: -10 + -400 = -410 -2x = -410 Divide each side by '-2'. x = 205 Simplifying x = 205
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