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10x + 9 + 11x - 3 = 90
21x + 6 = 90
21x = 90-6
21x = 84
x = 84 : 21
x = 4
<E = 10x + 9
<E = 10(4) + 9
<E = 40 + 9 = 49
21x+6 = 90 - 6
x = 84 : 21
X = 4
10x+9
10(4)+9
49