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3 years ago

А

Mathematics

1 answer:

ladessa [460]3 years ago

5 0

Answer:

$x = 4$

Step-by-step explanation:

$AD = BC$

$8x - 12 = 20$

$8x = 20 + 12$

$8x = 32$

$\frac{8x}{8} = \frac{32}{8}$

$x = 4$

to be sure

$8x - 12 { = }^{?} 20$

$8 \times 4 - 12 { = }^{?} 20$

$32 - 12 { = }^{?} 20$

$20 = 20$

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