2) приравниваем их
0,3х - 10=4 - 0,7х
х=14
3) 2х + 3 - (3 - 6х) = 16
2х + 3 - 3 +6х = 16
8х = 16
х=2
4) 3*(х+1) - 5х = 12
3х +3 - 5х = 12
-2х = 9
х= -4,5
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2) приравниваем их
0,3х - 10=4 - 0,7х
х=14
3) 2х + 3 - (3 - 6х) = 16
2х + 3 - 3 +6х = 16
8х = 16
х=2
4) 3*(х+1) - 5х = 12
3х +3 - 5х = 12
-2х = 9
х= -4,5