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t= -3,2
-(-3,2) - 4 = 3,2 - 4 = -0,8
b) -7x + 6y + 3x - 2y + x - 3y = -3x + y
x= -⅔
y= ⁴/₇
(-3 × -⅔) + ⁴/₇ = 2 + ⁴/₇ = 2 ⁴/₇