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Solve t^2-t=3(7+t)

Expand RHS: t² - t = 21+ 3tCollect all terms on one side: t² - 4t - 21 = 0Factorise and solve by inspection / use the quadratic formula to solve for t: (t + 3)(t - 7) = 0 / t = [ -(-4) ± ( (-4)² - 4x(1)x(-21) )^1/2 ] / 2(1)t = -3, t = 7

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