1) 5x-(3x+7)=83
5x-3x-7=83
2x-7=83
2x=83+7
2x=90
x=90/2
x=45
2) 57=15-(12-6x)
57=15-12+6x
57=3+6x
3+6x=57
6x=57-3
6x=54
x=54/6
x=9
3) 32=7x+(4x-45)
32=7x+4x-45
32+45=11x
11x=32+45
11x=77
x=77/11
x=7
4) 10x-(5-x)=39
10x-5+x=39
11x=39+5
11x=44
x=44/11
x=4
5) 48=13x-(5x-8)
48=13x-5x+8
48=8x+8
8x+8=48
8x=48-8
8x=40
x=40/8
x=5
6) 36=25x-(108+x)
36=25x-108-x
36=24x-108
24x-108=36
24x=36+108
24x=144
x=144/24
x=6