(х*3)-20:5=50
(х*3)-4=50
х*3=50+4
х*3=54
х=54:3
х=18
_______________________
(18*3)-20:5=50
50=50
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(х*3)-20:5=50
(х*3)-4=50
х*3=50+4
х*3=54
х=54:3
х=18
_______________________
(18*3)-20:5=50
50=50