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Simplifying 3 + -7(3 + 4x) = 18 3 + (3 * -7 + 4x * -7) = 18 3 + (-21 + -28x) = 18 Combine like terms: 3 + -21 = -18 -18 + -28x = 18 Solving -18 + -28x = 18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -28x = 18 + 18 Combine like terms: -18 + 18 = 0 0 + -28x = 18 + 18 -28x = 18 + 18 Combine like terms: 18 + 18 = 36 -28x = 36 Divide each side by '-28'. x = -1.285714286 Simplifying x = -1.285714286
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