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Simplifying 21 + -7x + 40 = -2 Reorder the terms: 21 + 40 + -7x = -2 Combine like terms: 21 + 40 = 61 61 + -7x = -2 Solving 61 + -7x = -2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-61' to each side of the equation. 61 + -61 + -7x = -2 + -61 Combine like terms: 61 + -61 = 0 0 + -7x = -2 + -61 -7x = -2 + -61 Combine like terms: -2 + -61 = -63 -7x = -63 Divide each side by '-7'. x = 9 Simplifying x = 9
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