5,7х-(4-3, 1x) =84
5,7х - 4 + 3,1x = 84
8,8x - 4 = 84
8,8x= 84 + 4
8,8x= 88
х=88:8,8
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5,7х-(4-3, 1x) =84
5,7х - 4 + 3,1x = 84
8,8x - 4 = 84
8,8x= 84 + 4
8,8x= 88
х=88:8,8
x= 10