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Simplifying 13 = 4x + 3(x + -5) Reorder the terms: 13 = 4x + 3(-5 + x) 13 = 4x + (-5 * 3 + x * 3) 13 = 4x + (-15 + 3x) Reorder the terms: 13 = -15 + 4x + 3x Combine like terms: 4x + 3x = 7x 13 = -15 + 7x Solving 13 = -15 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 13 + -7x = -15 + 7x + -7x Combine like terms: 7x + -7x = 0 13 + -7x = -15 + 0 13 + -7x = -15 Add '-13' to each side of the equation. 13 + -13 + -7x = -15 + -13 Combine like terms: 13 + -13 = 0 0 + -7x = -15 + -13 -7x = -15 + -13 Combine like terms: -15 + -13 = -28 -7x = -28 Divide each side by '-7'. x = 4 Simplifying x = 4
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