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Simplifying -336 = 7(1 + 7a) -336 = (1 * 7 + 7a * 7) -336 = (7 + 49a) Solving -336 = 7 + 49a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-49a' to each side of the equation. -336 + -49a = 7 + 49a + -49a Combine like terms: 49a + -49a = 0 -336 + -49a = 7 + 0 -336 + -49a = 7 Add '336' to each side of the equation. -336 + 336 + -49a = 7 + 336 Combine like terms: -336 + 336 = 0 0 + -49a = 7 + 336 -49a = 7 + 336 Combine like terms: 7 + 336 = 343 -49a = 343 Divide each side by '-49'. a = -7 Simplifying a = -7
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