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-¹/₂z + 4 = -1 |-4
-¹/₂z = -5 |*(-2)
z = 10
spr
-¹/₂*10+ 4 = -1
-5 + 4 = -1
-1 = -1
2x+22=33 |-22
2x = 11 | : 2
x = ¹¹/₂
spr
2*(¹¹/₂) + 22 = 33
11 +22 = 33
33 = 33
3x-16=4 |+16
3x = 20 |:3
x = ²°/₃
spr
3*(²°/₃) - 16 = 4
20-16 = 4
4 = 4
8x+7=4x+3 |-4x
4x + 7 = 3 |-7
4x = -4 |:4
x = -1
spr
8*(-1) + 7 = 4*(-1) + 3
-8 + 7 = -4 + 3
-1 = -1