(196+16)÷х+995=999
212÷х+995=999
212÷х=999-995
212÷х=4
х=212÷4
х=53
7×(777-х)+777=777
7×(777-х)=777-777
7×(777-х)=0
(777-х)=0÷7
(777-х)=0
х=777-0
х=777
16+х=450÷50+700
16+х=709
х=709-16
х=693
х=(769-419)÷7×15
х=350÷7×15
х=50×15
х=750
456÷2×3+х=999
228×3+х=999
684+х=999
х=999-684
х=315
(1+х)×3×3=3780
(1+х)×9=3780
1+х=420
х=420-1
х=419
(х-63)×10=25×4
456-426+(х×5)=90
х=8×45×3-200
976-х=596-555