10х-(-11х-(-3х))+9=81
10х-(-11х+3х)+9=81
10х+11-3х+9=81
18х=72
х=4
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10х-(-11х-(-3х))+9=81
10х-(-11х+3х)+9=81
10х+11-3х+9=81
18х=72
х=4