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Solve for x?

0 = -9/5 x -9

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0 = -9/5 x -9

9 = -9/5x

9/-9/5 = x

9* (-5/9) = x

-45/9 = -5 = x

Checking algebra answers, Is it correct
320km/1hr
↓
320km /1hr →1m/1.609km =320m/1.609hr÷=199.3mph
Answer: Round to nearest 10th =198.9mph

solve the following simultaneous equations by using cramer’s rule 3x-2y=3 ; 2x+y=6

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