1) 6,9x - 3.5 = 3,9x + 3,4
6.9x - 3.9x = 3.4 + 3.5
3x = 6.9
x = 2.3
2) 1.2(x - 5) = 2.5(x - 7)
1.2x - 6 = 2.5x - 17.5
1.2x - 2.5x = - 17.5
1.2x - 2.5x = - 17.5 + 6
-1.3x = -11.5
x = 8 11/13
b) |2x - 5| = 12
2x - 5 = 12 2x - 5 = -12
x = 8.5 x = - 3.5
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Answers & Comments
1) 6,9x - 3.5 = 3,9x + 3,4
6.9x - 3.9x = 3.4 + 3.5
3x = 6.9
x = 2.3
2) 1.2(x - 5) = 2.5(x - 7)
1.2x - 6 = 2.5x - 17.5
1.2x - 2.5x = - 17.5
1.2x - 2.5x = - 17.5 + 6
-1.3x = -11.5
x = 8 11/13
b) |2x - 5| = 12
2x - 5 = 12 2x - 5 = -12
x = 8.5 x = - 3.5