(2.61-4х):0.03+4.6=90
(2.61-4х):0.3=90-4.6
(2.61-4х):0.03=85.4
2.61-4х=2.562
-4х=2.562-2.61
-4х=-0.048
х=-0.048:(-4)
х=0.012
ОТВЕТ:0.012
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(2.61-4х):0.03+4.6=90
(2.61-4х):0.3=90-4.6
(2.61-4х):0.03=85.4
2.61-4х=2.562
-4х=2.562-2.61
-4х=-0.048
х=-0.048:(-4)
х=0.012
ОТВЕТ:0.012