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Simplifying 4x + -7(x + 3) = -18 Reorder the terms: 4x + -7(3 + x) = -18 4x + (3 * -7 + x * -7) = -18 4x + (-21 + -7x) = -18 Reorder the terms: -21 + 4x + -7x = -18 Combine like terms: 4x + -7x = -3x -21 + -3x = -18 Solving -21 + -3x = -18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -3x = -18 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = -18 + 21 -3x = -18 + 21 Combine like terms: -18 + 21 = 3 -3x = 3 Divide each side by '-3'. x = -1 Simplifying x = -1
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