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Simplifying x + (4x + -12) = 90 Reorder the terms: x + (-12 + 4x) = 90 Remove parenthesis around (-12 + 4x) x + -12 + 4x = 90 Reorder the terms: -12 + x + 4x = 90 Combine like terms: x + 4x = 5x -12 + 5x = 90 Solving -12 + 5x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 5x = 90 + 12 Combine like terms: -12 + 12 = 0 0 + 5x = 90 + 12 5x = 90 + 12 Combine like terms: 90 + 12 = 102 5x = 102 Divide each side by '5'. x = 20.4 Simplifying x = 20.4
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