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Simplifying 2(9x + -4) = 21 Reorder the terms: 2(-4 + 9x) = 21 (-4 * 2 + 9x * 2) = 21 (-8 + 18x) = 21 Solving -8 + 18x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 18x = 21 + 8 Combine like terms: -8 + 8 = 0 0 + 18x = 21 + 8 18x = 21 + 8 Combine like terms: 21 + 8 = 29 18x = 29 Divide each side by '18'. x = 1.611111111 Simplifying x = 1.611111111
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