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Simplifying 7x(15 + -1b) = 21 (15 * 7x + -1b * 7x) = 21 Reorder the terms: (-7bx + 105x) = 21 (-7bx + 105x) = 21 Solving -7bx + 105x = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-105x' to each side of the equation. -7bx + 105x + -105x = 21 + -105x Combine like terms: 105x + -105x = 0 -7bx + 0 = 21 + -105x -7bx = 21 + -105x Divide each side by '-7x'. b = -3x-1 + 15 Simplifying b = -3x-1 + 15 Reorder the terms: b = 15 + -3x-1
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