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Simplifying x + 7 + 2(3x + -4) = 90 Reorder the terms: x + 7 + 2(-4 + 3x) = 90 x + 7 + (-4 * 2 + 3x * 2) = 90 x + 7 + (-8 + 6x) = 90 Reorder the terms: 7 + -8 + x + 6x = 90 Combine like terms: 7 + -8 = -1 -1 + x + 6x = 90 Combine like terms: x + 6x = 7x -1 + 7x = 90 Solving -1 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 7x = 90 + 1 Combine like terms: -1 + 1 = 0 0 + 7x = 90 + 1 7x = 90 + 1 Combine like terms: 90 + 1 = 91 7x = 91 Divide each side by '7'. x = 13 Simplifying x = 13
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