4Б+3м=132
2Б+3м=84
2Б+2Б+3м=132
2Б=132-84
2Б=48
48+3м=84
3м=84-48
3м=36
м=36:3
м=12
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4Б+3м=132
2Б+3м=84
2Б+2Б+3м=132
2Б=132-84
2Б=48
48+3м=84
3м=84-48
3м=36
м=36:3
м=12