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Simplifying 90 = (4x + 42) Reorder the terms: 90 = (42 + 4x) Remove parenthesis around (42 + 4x) 90 = 42 + 4x Solving 90 = 42 + 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 = 42 + 4x + -4x Combine like terms: 4x + -4x = 0 90 + -4x = 42 + 0 90 + -4x = 42 Add '-90' to each side of the equation. 90 + -90 + -4x = 42 + -90 Combine like terms: 90 + -90 = 0 0 + -4x = 42 + -90 -4x = 42 + -90 Combine like terms: 42 + -90 = -48 -4x = -48 Divide each side by '-4'. x = 12 Simplifying x = 12
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