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Simplifying 7x + 21 + 3x + 9 = 7x + -7 Reorder the terms: 21 + 9 + 7x + 3x = 7x + -7 Combine like terms: 21 + 9 = 30 30 + 7x + 3x = 7x + -7 Combine like terms: 7x + 3x = 10x 30 + 10x = 7x + -7 Reorder the terms: 30 + 10x = -7 + 7x Solving 30 + 10x = -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. 30 + 10x + -7x = -7 + 7x + -7x Combine like terms: 10x + -7x = 3x 30 + 3x = -7 + 7x + -7x Combine like terms: 7x + -7x = 0 30 + 3x = -7 + 0 30 + 3x = -7 Add '-30' to each side of the equation. 30 + -30 + 3x = -7 + -30 Combine like terms: 30 + -30 = 0 0 + 3x = -7 + -30 3x = -7 + -30 Combine like terms: -7 + -30 = -37 3x = -37 Divide each side by '3'. x = -12.33333333 Simplifying x = -12.33333333
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