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3x - 2 + 4x = 1,5x + 0,75
3x - 4x - 1,5x = 2 + 0,75
-2,5x = 2,75//: -2,5
x = -1,1
b) 3⅓x+8=4⅖x-8
3⅓x - 4⅖x = 8 - 8
-2⁶/₁₅x = 0//: -2⁶/₁₅x
x = 0
x:2+x:4+x:5=x-1
x/2 + x/4 + x/5 - x/1 = -1
-x = -1//: -1
x = 1