Question

5z+1 divide by 3 = 7​

Answer 1

z=4

Step-by-step explanation:

5z+1/3=7

5z+1=7*3

5z+1=21

5z=21-1

5z=20

z=20/5

z=4

Answer 2

$\frac{5z + 1}{3} = 7$

$5z + 1 = 7(3)$

(by cross multiplication)

$5z + 1 = 21$

$5z = 21 - 1$

$5z = 20$

$z = \frac{20}{5}$

$z = 4$

let us verify,

$\frac{5z + 1}{3} = 7$

$\frac{5(4) + 1}{3} = 7$

$\frac{20 + 1}{3} = 7$

$\frac{21}{3} = 7$

by cancellation,

therefore

$lhs = rhs$

hence proved

z = 4