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Simplifying 90 = (3x + 70) + (x + 20) Reorder the terms: 90 = (70 + 3x) + (x + 20) Remove parenthesis around (70 + 3x) 90 = 70 + 3x + (x + 20) Reorder the terms: 90 = 70 + 3x + (20 + x) Remove parenthesis around (20 + x) 90 = 70 + 3x + 20 + x Reorder the terms: 90 = 70 + 20 + 3x + x Combine like terms: 70 + 20 = 90 90 = 90 + 3x + x Combine like terms: 3x + x = 4x 90 = 90 + 4x Add '-90' to each side of the equation. 90 + -90 = 90 + -90 + 4x Combine like terms: 90 + -90 = 0 0 = 90 + -90 + 4x Combine like terms: 90 + -90 = 0 0 = 0 + 4x 0 = 4x Solving 0 = 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 0 + -4x = 4x + -4x Remove the zero: -4x = 4x + -4x Combine like terms: 4x + -4x = 0 -4x = 0 Divide each side by '-4'. x = 0 Simplifying x = 0
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