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x+3y = 10 x= 10 - 3y
2. 10 - 3y + y = 12
20 - 2y = 12
-2y = 12 - 20
-2y = -8
y = -8/-2 = 4
x+3.4 = 10
x + 12 = 10
x= 10-12
x = -2