Question

Уравнение -3 (x+3)=-12
0,02x+1,38=-0,02

Answer 1

-3(x+3)=-12     
-3x+9=-12
-3x=-12-9
-3x=-21
x=-21:(-3)
x=7
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0.02x+1.38=-0.02
0.02x=-0.02-1.38
0.02x=1.4
x=1.4:0.02
x=70