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Simplifying 145 = 4x + 3(3x + 18) Reorder the terms: 145 = 4x + 3(18 + 3x) 145 = 4x + (18 * 3 + 3x * 3) 145 = 4x + (54 + 9x) Reorder the terms: 145 = 54 + 4x + 9x Combine like terms: 4x + 9x = 13x 145 = 54 + 13x Solving 145 = 54 + 13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13x' to each side of the equation. 145 + -13x = 54 + 13x + -13x Combine like terms: 13x + -13x = 0 145 + -13x = 54 + 0 145 + -13x = 54 Add '-145' to each side of the equation. 145 + -145 + -13x = 54 + -145 Combine like terms: 145 + -145 = 0 0 + -13x = 54 + -145 -13x = 54 + -145 Combine like terms: 54 + -145 = -91 -13x = -91 Divide each side by '-13'. x = 7 Simplifying x = 7
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