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Simplifying 90 = (3x + 3) + (x + 7) Reorder the terms: 90 = (3 + 3x) + (x + 7) Remove parenthesis around (3 + 3x) 90 = 3 + 3x + (x + 7) Reorder the terms: 90 = 3 + 3x + (7 + x) Remove parenthesis around (7 + x) 90 = 3 + 3x + 7 + x Reorder the terms: 90 = 3 + 7 + 3x + x Combine like terms: 3 + 7 = 10 90 = 10 + 3x + x Combine like terms: 3x + x = 4x 90 = 10 + 4x Solving 90 = 10 + 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. 90 + -4x = 10 + 4x + -4x Combine like terms: 4x + -4x = 0 90 + -4x = 10 + 0 90 + -4x = 10 Add '-90' to each side of the equation. 90 + -90 + -4x = 10 + -90 Combine like terms: 90 + -90 = 0 0 + -4x = 10 + -90 -4x = 10 + -90 Combine like terms: 10 + -90 = -80 -4x = -80 Divide each side by '-4'. x = 20 Simplifying x = 20
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