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Simplifying 40 + -7x = 2x + 21 Reorder the terms: 40 + -7x = 21 + 2x Solving 40 + -7x = 21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 40 + -7x + -2x = 21 + 2x + -2x Combine like terms: -7x + -2x = -9x 40 + -9x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 40 + -9x = 21 + 0 40 + -9x = 21 Add '-40' to each side of the equation. 40 + -40 + -9x = 21 + -40 Combine like terms: 40 + -40 = 0 0 + -9x = 21 + -40 -9x = 21 + -40 Combine like terms: 21 + -40 = -19 -9x = -19 Divide each side by '-9'. x = 2.111111111 Simplifying x = 2.111111111
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