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Simplifying -7(2b + 2) + (15b + -7) = 0 Reorder the terms: -7(2 + 2b) + (15b + -7) = 0 (2 * -7 + 2b * -7) + (15b + -7) = 0 (-14 + -14b) + (15b + -7) = 0 Reorder the terms: -14 + -14b + (-7 + 15b) = 0 Remove parenthesis around (-7 + 15b) -14 + -14b + -7 + 15b = 0 Reorder the terms: -14 + -7 + -14b + 15b = 0 Combine like terms: -14 + -7 = -21 -21 + -14b + 15b = 0 Combine like terms: -14b + 15b = 1b -21 + 1b = 0 Solving -21 + 1b = 0 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 1b = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 1b = 0 + 21 1b = 0 + 21 Combine like terms: 0 + 21 = 21 1b = 21 Divide each side by '1'. b = 21 Simplifying b = 21
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