3(4+х)-7(х+6)=-21
12+3х-7х-42=-21
-4х-30=-21
-4х=9
х=-9/4
х=-2,25
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3(4+х)-7(х+6)=-21
12+3х-7х-42=-21
-4х-30=-21
-4х=9
х=-9/4
х=-2,25