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Simplifying 3(3x + -7) = 81(12x + -3x) Reorder the terms: 3(-7 + 3x) = 81(12x + -3x) (-7 * 3 + 3x * 3) = 81(12x + -3x) (-21 + 9x) = 81(12x + -3x) Combine like terms: 12x + -3x = 9x -21 + 9x = 81(9x) Remove parenthesis around (9x) -21 + 9x = 81 * 9x Multiply 81 * 9 -21 + 9x = 729x Solving -21 + 9x = 729x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-729x' to each side of the equation. -21 + 9x + -729x = 729x + -729x Combine like terms: 9x + -729x = -720x -21 + -720x = 729x + -729x Combine like terms: 729x + -729x = 0 -21 + -720x = 0 Add '21' to each side of the equation. -21 + 21 + -720x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -720x = 0 + 21 -720x = 0 + 21 Combine like terms: 0 + 21 = 21 -720x = 21 Divide each side by '-720'. x = -0.02916666667 Simplifying x = -0.02916666667
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