2.
3*у*1,8=5,4у
х*(-12,5)*4=-50х
-7*a*(-10/7)*b=10ab
4.
3,6х-4,8х=-12
-1,2х=-12
х=10
5.
х+у+z=65
x+1,4x+17=65
2,4х=48
х=20
20+у+17=65
у=28
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Answers & Comments
2.
3*у*1,8=5,4у
х*(-12,5)*4=-50х
-7*a*(-10/7)*b=10ab
4.
3,6х-4,8х=-12
-1,2х=-12
х=10
5.
х+у+z=65
x+1,4x+17=65
2,4х=48
х=20
20+у+17=65
у=28