9х+5=50; 8х-4=36;77-13х=12

Question

9х+5=50; 8х-4=36;77-13х=12

Answer 1

9x=50-5
9x=45
x=5;
8x=36+4
8x=40
x=5;
-13x=12-77
-13x=-65
x=5

Comments

спасибо

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нез

Answer 2

9×=50-5
9×=45
×=45:9
×=5

8×-4=36
8×=36+4
8×=40
×=40:8
×=5

77-13×=12
13×=77-12
13×=65
×=65:13
×=5