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2*{12+3[60-3*(27-4*3)]}-5x=7


Răspuns :

2 x { 12 +3[60-3 x ( 27-12)]}-5x=7
2x [12+3x (60- 3x15)]-5x=7
2x[12+3x (60-45)]-5x=7
2x(12+3x15)-5x=7
2x(12+45)-5x=7
2x56-5x=7
112-5x=7
-5x+112=7
-5x= 7-112
-5x=-105/x (-1)
5x=105
x=21
2 x { 12 +3[60-3 x ( 27-12)]}-5x=7
2x [12+3x (60- 3x15)]-5x=7
2x[12+3x (60-45)]-5x=7
2x(12+3x15)-5x=7
2x(12+45)-5x=7
2x56-5x=7
112-5x=7
112-7=5x
105=5x
x=105:5
x=21