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-2,8*(3х +7)-4,2=1,4

-2,8*(3х +7)-4,2=1,4-8,4х - 19,6 - 4,2 = 1,4-8,4х = 1,4 + 19,6 + 4,2-8,4х = 25,28,4х = -25,2х = (-25,2) : 8,4х = -3или так:-2,8*(3х +7)-4,2=1,4-2,8*(3х +7)=1,4 + 4,2-2,8*(3х +7) = 5,63х + 7 = 5,6 : (-2,8)3х + 7 = -23х = -2-73х = -9х = (-9) : 3х = -3

-8,4х+19,6-4,2=1,4-8,4х+15,4=1,4-8,4х=1,4-15,4-8,4х=-148,4х=14х=14/1:84/10=14/1*10/84=5/6х=5/6