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Simplifying -315 = 7(7x + -3) + 7x Reorder the terms: -315 = 7(-3 + 7x) + 7x -315 = (-3 * 7 + 7x * 7) + 7x -315 = (-21 + 49x) + 7x Combine like terms: 49x + 7x = 56x -315 = -21 + 56x Solving -315 = -21 + 56x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-56x' to each side of the equation. -315 + -56x = -21 + 56x + -56x Combine like terms: 56x + -56x = 0 -315 + -56x = -21 + 0 -315 + -56x = -21 Add '315' to each side of the equation. -315 + 315 + -56x = -21 + 315 Combine like terms: -315 + 315 = 0 0 + -56x = -21 + 315 -56x = -21 + 315 Combine like terms: -21 + 315 = 294 -56x = 294 Divide each side by '-56'. x = -5.25 Simplifying x = -5.25
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