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5(x+1)=10
5x + 5 = 10
5x = 10 - 5
5x = 5 /:5
x = 1
b)
2(x-2)-1=5
2x - 4 - 1 = 5
2x = 5 + 4 + 1
2x = 10 /:2
x = 5
c)
3x+5x-8=0
3x + 5x = 8
8x = 8 /:8
x = 1