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Simplifying 198 = 7(9x + -9) + 9 Reorder the terms: 198 = 7(-9 + 9x) + 9 198 = (-9 * 7 + 9x * 7) + 9 198 = (-63 + 63x) + 9 Reorder the terms: 198 = -63 + 9 + 63x Combine like terms: -63 + 9 = -54 198 = -54 + 63x Solving 198 = -54 + 63x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-63x' to each side of the equation. 198 + -63x = -54 + 63x + -63x Combine like terms: 63x + -63x = 0 198 + -63x = -54 + 0 198 + -63x = -54 Add '-198' to each side of the equation. 198 + -198 + -63x = -54 + -198 Combine like terms: 198 + -198 = 0 0 + -63x = -54 + -198 -63x = -54 + -198 Combine like terms: -54 + -198 = -252 -63x = -252 Divide each side by '-63'. x = 4 Simplifying x = 4
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