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Simplifying 315 = 7(6b + -3) Reorder the terms: 315 = 7(-3 + 6b) 315 = (-3 * 7 + 6b * 7) 315 = (-21 + 42b) Solving 315 = -21 + 42b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-42b' to each side of the equation. 315 + -42b = -21 + 42b + -42b Combine like terms: 42b + -42b = 0 315 + -42b = -21 + 0 315 + -42b = -21 Add '-315' to each side of the equation. 315 + -315 + -42b = -21 + -315 Combine like terms: 315 + -315 = 0 0 + -42b = -21 + -315 -42b = -21 + -315 Combine like terms: -21 + -315 = -336 -42b = -336 Divide each side by '-42'. b = 8 Simplifying b = 8
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