( x - 80 ) * 40 = 640

Question

( x - 80 ) * 40 = 640

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Answer 1

x-80=640:40

x-80=16

x=16+80

x=96

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Answer 2

(x-80) * 40 = 640
40х - 3200 = 640
40х = 640 + 3200
40х = 3840
х = 96 

(х - 80) : 40 = 640
x/40 - 80/40 = 640
x/40 -2 = 640
x - 80 = 25600
x = 25600 + 80
x = 25680