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First you have calculate values in brackets, next division then multiplication, after multiplication, addition finally subtraction.

In this case, [-2*4+5-3 (-2)*(-2)+5*2]

=[-2*4+5-(-6)*(-2)+5*2] (multiply 3 with -2)

=[-2*4+5-12+5*2] (multiply 6 with -2)

=[-8+5-12+10] (multiply -2 with 4 and 5 with 2)

=[-3-2]

=-5

-2*4=-8

so

-8+5=-3

-3*4=-12

so

-3-12=-15

now 5*2=10

so

-15+10=5

s0

-8+5-12+10=-5

so

-8+5=-3

-3*4=-12

so

-3-12=-15

now 5*2=10

so

-15+10=5

s0

-8+5-12+10=-5