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7x - 2 = 2x + 8
7x - 2x = 8 + 2
5x = 10
x = 2
b. a.7x - 2
7.2 - 2
14 - 2
= 12
b. 2x + 8
2.2 + 8
4 + 8
= 12
7x-2x=2+8
5x = 10
x = 10:5
x = 2
b. diagonal 1 =d1
diagonal 2= d2
d1= (7x-2) = 7.2-2= 12
d2= (2x+8) = 2.2+8= 12