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108 = 4x + 3x
108 = 7x
x = 108/7
x = 15,4
a = 4x
a = 4.15,4
a = 81,6
t=3x
t=3.15,4
t=36,2
4x . 3x= 108
12(x^2)=108
x^2=108÷12
x^2=9
x=9
4x= 4 . 9
4x=36
3x=3 . 9
3x=27