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Simplifying 90 = 63 + x + 20 Reorder the terms: 90 = 63 + 20 + x Combine like terms: 63 + 20 = 83 90 = 83 + x Solving 90 = 83 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 90 + -1x = 83 + x + -1x Combine like terms: x + -1x = 0 90 + -1x = 83 + 0 90 + -1x = 83 Add '-90' to each side of the equation. 90 + -90 + -1x = 83 + -90 Combine like terms: 90 + -90 = 0 0 + -1x = 83 + -90 -1x = 83 + -90 Combine like terms: 83 + -90 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7
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