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(2 x a + 2 ) x 3:4:7 = 18​

Răspuns :

(2a+2)x3:4= 18x7

(2a+2)x3:4 = 126

(2a+2)x3 = 126*4

(2a+2)x3 = 504

2a+2= 504:3

2a+2 = 168

2a=168-2

2a = 166

a = 166:2

a = 83