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Simplifying 18 + 13b = -18 + 15b Solving 18 + 13b = -18 + 15b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-15b' to each side of the equation. 18 + 13b + -15b = -18 + 15b + -15b Combine like terms: 13b + -15b = -2b 18 + -2b = -18 + 15b + -15b Combine like terms: 15b + -15b = 0 18 + -2b = -18 + 0 18 + -2b = -18 Add '-18' to each side of the equation. 18 + -18 + -2b = -18 + -18 Combine like terms: 18 + -18 = 0 0 + -2b = -18 + -18 -2b = -18 + -18 Combine like terms: -18 + -18 = -36 -2b = -36 Divide each side by '-2'. b = 18 Simplifying b = 18
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