1) (3•2x):7=42
6x:7=42
x=49
2) 7*2x*13=910
14х=910/13
14х=70
х=70/14
х=5
3) 5(2x+27)=405
10x+135=405
10х=405-135
10х=270
х=27
4) (5х+2х):2=252
7х=252*2
7х=504
х=504:7
х=72
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Answers & Comments
1) (3•2x):7=42
6x:7=42
6x:7=42
x=49
2) 7*2x*13=910
14х=910/13
14х=70
х=70/14
х=5
3) 5(2x+27)=405
10x+135=405
10х=405-135
10х=270
х=27
4) (5х+2х):2=252
7х=252*2
7х=504
х=504:7
х=72