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Simplifying 1(7x) + -135 = 3x + 285 Remove parenthesis around (7x) 1 * 7x + -135 = 3x + 285 Multiply 1 * 7 7x + -135 = 3x + 285 Reorder the terms: -135 + 7x = 3x + 285 Reorder the terms: -135 + 7x = 285 + 3x Solving -135 + 7x = 285 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -135 + 7x + -3x = 285 + 3x + -3x Combine like terms: 7x + -3x = 4x -135 + 4x = 285 + 3x + -3x Combine like terms: 3x + -3x = 0 -135 + 4x = 285 + 0 -135 + 4x = 285 Add '135' to each side of the equation. -135 + 135 + 4x = 285 + 135 Combine like terms: -135 + 135 = 0 0 + 4x = 285 + 135 4x = 285 + 135 Combine like terms: 285 + 135 = 420 4x = 420 Divide each side by '4'. x = 105 Simplifying x = 105
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