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Simplifying 130 + -1x = 3(90 + -1x) 130 + -1x = (90 * 3 + -1x * 3) 130 + -1x = (270 + -3x) Solving 130 + -1x = 270 + -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. 130 + -1x + 3x = 270 + -3x + 3x Combine like terms: -1x + 3x = 2x 130 + 2x = 270 + -3x + 3x Combine like terms: -3x + 3x = 0 130 + 2x = 270 + 0 130 + 2x = 270 Add '-130' to each side of the equation. 130 + -130 + 2x = 270 + -130 Combine like terms: 130 + -130 = 0 0 + 2x = 270 + -130 2x = 270 + -130 Combine like terms: 270 + -130 = 140 2x = 140 Divide each side by '2'. x = 70 Simplifying x = 70
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