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Simplifying 21x + 12 = 7x + -18 Reorder the terms: 12 + 21x = 7x + -18 Reorder the terms: 12 + 21x = -18 + 7x Solving 12 + 21x = -18 + 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. 12 + 21x + -7x = -18 + 7x + -7x Combine like terms: 21x + -7x = 14x 12 + 14x = -18 + 7x + -7x Combine like terms: 7x + -7x = 0 12 + 14x = -18 + 0 12 + 14x = -18 Add '-12' to each side of the equation. 12 + -12 + 14x = -18 + -12 Combine like terms: 12 + -12 = 0 0 + 14x = -18 + -12 14x = -18 + -12 Combine like terms: -18 + -12 = -30 14x = -30 Divide each side by '14'. x = -2.142857143 Simplifying x = -2.142857143
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