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Simplifying 90 = 15(2) + b Multiply 15 * 2 90 = 30 + b Solving 90 = 30 + b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1b' to each side of the equation. 90 + -1b = 30 + b + -1b Combine like terms: b + -1b = 0 90 + -1b = 30 + 0 90 + -1b = 30 Add '-90' to each side of the equation. 90 + -90 + -1b = 30 + -90 Combine like terms: 90 + -90 = 0 0 + -1b = 30 + -90 -1b = 30 + -90 Combine like terms: 30 + -90 = -60 -1b = -60 Divide each side by '-1'. b = 60 Simplifying b = 60
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