Răspuns :
2*{12+3*[60-3*15]}-5x=7
2*{12+3*15}-5x=7
2*57-5x =7
114-5x=7
-5x= -107
x= 21.4
2*{12+3*15}-5x=7
2*57-5x =7
114-5x=7
-5x= -107
x= 21.4
2x[12+3×(60-3x15)]-5x=7. = 2×(12+3×15)-5x=7. = 2×57-5x=7. =114-5x=7. = 5x=114-7. = 5x=107. = x=107\5
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