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5x = 20 ||:5
x = 4
b) 7x +x = 8
8x = 8 || : 8
x = 1
c) 10x - 5x = 100
5x = 100 || : 5
x = 20
d) 11x - x = 10
10x = 10 ||: 10
x = 1
2x+3x=20
5x=20 /:5
x=4
7x+x=8
8x=8 /:8
x=1
10x-5x=100
5x=100 /:5
x=20
11x-x=10
10x=10 /:10
x=1