Question

{[72+53x(12+a)]-27x15}:761+8=10

Answer 1

{[72+53×(12+a)]-27×15}:761+8=10 /-8
{[72+53×(12+a)]-27×15}:761=2 /×761
72+53×(12+a)-27×15=1522
72+636+53a-405=1522 /+405
708+53a=1927 /-708
53a=1219
a=23

coroana?

Answer 2

{ [ 72 + 53 × ( 12 + a ) ] - 27 × 15 } : 761 + 8 = 10

{ [ 72 + 53 × ( 12 + a ) ] - 405 } : 761 = 10 - 8

{ [ 72 + 53 × ( 12 + a ) ] - 405 } : 761 = 2

[ 72 + 53 × ( 12 + a ) ] - 405 = 2 × 761

[ 72 + 53 × ( 12 + a ) ] - 405 = 1 522

72 + 53 × ( 12 + a ) = 1 522 + 405

72 + 53 × ( 12 + a ) = 1 927

53 × ( 12 + a ) =  1 927 - 72

53 × ( 12 + a ) = 1 855

12 + a = 1 855 : 53

12 + a = 35

a = 35 - 12

a = 23