7(1/2x+4,2)-3,4=42 и 7(1/2x+4,2)-3,4=40

Question

7(1/2x+4,2)-3,4=42 и 7(1/2x+4,2)-3,4=40

Answer 1

1))3,5х+29,4-3,4=42;
3,5х=42-29,4+3,4;
3,5х=16;
х=16:3,5;
х=16/3,5;
х=160/35;
х=32/7;
х=4 4/7;
2)3,5х+29,4-3,4=40;
3,5х+26=40;
3,5х=40-26;
3,5х=14;
х=14:3,5;
х=4