2х+7х-12=69 ПОМОГИТЕ РЕШИТЬ

Question

2х+7х-12=69

ПОМОГИТЕ РЕШИТЬ

Comments

2х+7х-12=699х=69+129х=81х=81:9х=9.

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djn

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вот

Answer 1

9x=69+12
9x=81
x=81:9
x=9

Answer 2

2х+7х-12=69
9х-12=69
9х=69-12
х=57