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x=10-5
x=5
b) 2x+3=15
2x=15-3
2x=12 /:2
x=6
c) 5x+13=23
5x=23-13
5x=10 /:5
x=2
d) (x+3)=10
x+3=10
x=10-3
x=7
e) 3(x+3)=2(x+4)
3x+9=2x+8
3x-2x=8-9
x=-1
f) 4(3x+2)=5(2x+3)
12x+8=10x+15
12x-10x=15-8
2x=7 /:2
x=3,5