Ответ:
(236+x)-78=432
236+x-78=432
x=432-236+78
x=274
(x-440+240)+240=560
x-440+240+240=560
x=560+440-240-240
x=520
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Ответ:
(236+x)-78=432
236+x-78=432
x=432-236+78
x=274
(x-440+240)+240=560
x-440+240+240=560
x=560+440-240-240
x=520