Question

7(1-x)+21=14
1-9x+5(2x-3) mai mare sau egal cu 19

Answer 1

7(1-x)+21=14
7-7x+21=14
-7x+28=14
-7x=14-28
-7x= -14 |:(-7)
x=2

1-9x+5(2x-3)$\geq$19
1-9x+10x-15$\geq$19
x-14$\geq$19
x$\geq$19+14
x$\geq$33