(20х-70):5=90
20х-70=90*5
20х-70=450
20х=450+70
20х=520
Х=520:20
Х=26
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(20х-70):5=90
20х-70=90*5
20х-70=450
20х=450+70
20х=520
Х=520:20
Х=26