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2x+3=-5
2x=-5-3
2x=-8
x=-4
b] 0,4 + 0,25x = -2 /*100
40+25x=-200
25x=-200-40
25x=-240 /:25
x=-9,6
c] 2,1 - 0,3x = 0,4x /*10
21-3x=4x
-3x-4x=-21
-7x=-21
x=3
d] -1,5x - 3 = 0,2x +6 /*10
-15x-30=2x+60
-15x-2x=60+30
-17x=90
x=-90/17= -5 całych i 5/7
2.
a] -7(x-2) = 3x -1
-7x+14=3x-1
-7x-3x=-1-14
-10x=-15
x=1,5
b] 4(x-1) = 6(1 + x)
4x-4=6+6x
4x-6x=6+4
-2x=10
x=-5