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Simplifying 7x + -3(5x + -12) = -20 Reorder the terms: 7x + -3(-12 + 5x) = -20 7x + (-12 * -3 + 5x * -3) = -20 7x + (36 + -15x) = -20 Reorder the terms: 36 + 7x + -15x = -20 Combine like terms: 7x + -15x = -8x 36 + -8x = -20 Solving 36 + -8x = -20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + -8x = -20 + -36 Combine like terms: 36 + -36 = 0 0 + -8x = -20 + -36 -8x = -20 + -36 Combine like terms: -20 + -36 = -56 -8x = -56 Divide each side by '-8'. x = 7 Simplifying x = 7
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