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Simplifying 30 + -9x = 21 + -7x Solving 30 + -9x = 21 + -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 + -9x + 7x = 21 + -7x + 7x Combine like terms: -9x + 7x = -2x 30 + -2x = 21 + -7x + 7x Combine like terms: -7x + 7x = 0 30 + -2x = 21 + 0 30 + -2x = 21 Add '-30' to each side of the equation. 30 + -30 + -2x = 21 + -30 Combine like terms: 30 + -30 = 0 0 + -2x = 21 + -30 -2x = 21 + -30 Combine like terms: 21 + -30 = -9 -2x = -9 Divide each side by '-2'. x = 4.5 Simplifying x = 4.5
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