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Simplifying 20 + -1x = 90 + 3x Solving 20 + -1x = 90 + 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. 20 + -1x + -3x = 90 + 3x + -3x Combine like terms: -1x + -3x = -4x 20 + -4x = 90 + 3x + -3x Combine like terms: 3x + -3x = 0 20 + -4x = 90 + 0 20 + -4x = 90 Add '-20' to each side of the equation. 20 + -20 + -4x = 90 + -20 Combine like terms: 20 + -20 = 0 0 + -4x = 90 + -20 -4x = 90 + -20 Combine like terms: 90 + -20 = 70 -4x = 70 Divide each side by '-4'. x = -17.5 Simplifying x = -17.5
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