Question

solve the following equations .
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Answer 1

Step-by-step explanation:

(0.4z - 3)/(1.5z + 9) = 7/5

Cross multiplication

5(0.4z - 3) = 7(1.5z + 9)

2z - 15 = 10.5z + 63

2z - 10.5z = 63+15

-8.5z = 78

z = -78/8.5

z = -9.17