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Simplifying 9x + -4(x + -3) = 15x Reorder the terms: 9x + -4(-3 + x) = 15x 9x + (-3 * -4 + x * -4) = 15x 9x + (12 + -4x) = 15x Reorder the terms: 12 + 9x + -4x = 15x Combine like terms: 9x + -4x = 5x 12 + 5x = 15x Solving 12 + 5x = 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 12 + 5x + -15x = 15x + -15x Combine like terms: 5x + -15x = -10x 12 + -10x = 15x + -15x Combine like terms: 15x + -15x = 0 12 + -10x = 0 Add '-12' to each side of the equation. 12 + -12 + -10x = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -10x = 0 + -12 -10x = 0 + -12 Combine like terms: 0 + -12 = -12 -10x = -12 Divide each side by '-10'. x = 1.2 Simplifying x = 1.2
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