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Simplifying 315 = -7(-7x + 4) Reorder the terms: 315 = -7(4 + -7x) 315 = (4 * -7 + -7x * -7) 315 = (-28 + 49x) Solving 315 = -28 + 49x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-49x' to each side of the equation. 315 + -49x = -28 + 49x + -49x Combine like terms: 49x + -49x = 0 315 + -49x = -28 + 0 315 + -49x = -28 Add '-315' to each side of the equation. 315 + -315 + -49x = -28 + -315 Combine like terms: 315 + -315 = 0 0 + -49x = -28 + -315 -49x = -28 + -315 Combine like terms: -28 + -315 = -343 -49x = -343 Divide each side by '-49'. x = 7 Simplifying x = 7
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