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Simplifying 21 + 35 = 7x + -7 Combine like terms: 21 + 35 = 56 56 = 7x + -7 Reorder the terms: 56 = -7 + 7x Solving 56 = -7 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 56 + -7x = -7 + 7x + -7x Combine like terms: 7x + -7x = 0 56 + -7x = -7 + 0 56 + -7x = -7 Add '-56' to each side of the equation. 56 + -56 + -7x = -7 + -56 Combine like terms: 56 + -56 = 0 0 + -7x = -7 + -56 -7x = -7 + -56 Combine like terms: -7 + -56 = -63 -7x = -63 Divide each side by '-7'. x = 9 Simplifying x = 9
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