Ответ:
28х+5х=99
33х99
99:33х
х=3
1. 28x+5x=99
33x=99
x=99/33=3
2. 100-30а = 140
-30a=140-100=40
30a=-40
a=-40/30= -4/3
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Ответ:
28х+5х=99
33х99
99:33х
х=3
Verified answer
Ответ:
1. 28x+5x=99
33x=99
x=99/33=3
2. 100-30а = 140
-30a=140-100=40
30a=-40
a=-40/30= -4/3