Ответ:
4x = 3/5
х=3/5÷4=3/5×1/4=3/20
x=3/20
9/10x -4/15 x =7 3/5
27/30x-8/30x=7 18/30
19/30x=7 18/30
x=7 18/30 :19/30=228÷19
x=12
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Ответ:
4x = 3/5
х=3/5÷4=3/5×1/4=3/20
x=3/20
9/10x -4/15 x =7 3/5
27/30x-8/30x=7 18/30
19/30x=7 18/30
x=7 18/30 :19/30=228÷19
x=12