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Simplifying 90 = 4t + -19t Combine like terms: 4t + -19t = -15t 90 = -15t Solving 90 = -15t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '15t' to each side of the equation. 90 + 15t = -15t + 15t Combine like terms: -15t + 15t = 0 90 + 15t = 0 Add '-90' to each side of the equation. 90 + -90 + 15t = 0 + -90 Combine like terms: 90 + -90 = 0 0 + 15t = 0 + -90 15t = 0 + -90 Combine like terms: 0 + -90 = -90 15t = -90 Divide each side by '15'. t = -6 Simplifying t = -6
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