Question

3 - 1/10b = 7

thank you...................................................

Answer 1

Answer: b = 7

1. Make unknown variable to left side (It is already), and numbers to the left, without forgetting to change the sign:


`3 - (1)/(10)b = 7` =

`- (1)/(10)b = 7 - 3` =

`- (1)/(10)b = 4`

2. Multiply both sides by -10 to get answer (1b = ?):


`- (1)/(10)b = 4` |*(-10)

`b = -40`

So the answer is -40.

Proof:
3 - 1/10 * (-40) = 3 - (-4) = 3 + 4 = 7