2) (30-х)*7=188
30-х=188:7
х=30-26,85
х=3,15
3) 3,2х-1,5=1,7
3,2х=1,7+1,5
х=3,2:3,2
х=1
4)(х+2х)+2=8
3х+2=8
3х=8-2
х=6:3
х=2
5) (2х+х)-78=177
3х-78=177
3х=177-78
х=99:3
х=33
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Answers & Comments
2) (30-х)*7=188
30-х=188:7
х=30-26,85
х=3,15
3) 3,2х-1,5=1,7
3,2х=1,7+1,5
х=3,2:3,2
х=1
4)(х+2х)+2=8
3х+2=8
3х=8-2
х=6:3
х=2
5) (2х+х)-78=177
3х-78=177
3х=177-78
х=99:3
х=33