75:(69-4*x)=15
69-4*x=75:15
69-4*x=5
4*x=69-5
4*x=64
x=64:4
x=16
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75:(69-4*16)=15
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75:(69-4*x)=15
69-4*x=75:15
69-4*x=5
4*x=69-5
4*x=64
x=64:4
x=16
-----------------------------------
75:(69-4*16)=15
(69-4*×)=75*15
(69-4*×)=...
4*×=69+...
4*×=........
дальше как простое уравнение(.....-реши пример и твой ответ)