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Simplifying 2x + 4(x + -1) = 90 Reorder the terms: 2x + 4(-1 + x) = 90 2x + (-1 * 4 + x * 4) = 90 2x + (-4 + 4x) = 90 Reorder the terms: -4 + 2x + 4x = 90 Combine like terms: 2x + 4x = 6x -4 + 6x = 90 Solving -4 + 6x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 6x = 90 + 4 Combine like terms: -4 + 4 = 0 0 + 6x = 90 + 4 6x = 90 + 4 Combine like terms: 90 + 4 = 94 6x = 94 Divide each side by '6'. x = 15.66666667 Simplifying x = 15.66666667
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