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Simplifying -144 = 3(1 + -7x) -144 = (1 * 3 + -7x * 3) -144 = (3 + -21x) Solving -144 = 3 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. -144 + 21x = 3 + -21x + 21x Combine like terms: -21x + 21x = 0 -144 + 21x = 3 + 0 -144 + 21x = 3 Add '144' to each side of the equation. -144 + 144 + 21x = 3 + 144 Combine like terms: -144 + 144 = 0 0 + 21x = 3 + 144 21x = 3 + 144 Combine like terms: 3 + 144 = 147 21x = 147 Divide each side by '21'. x = 7 Simplifying x = 7
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