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5x+3=a
5 * 10 + 3 = a
a = 53
b)
2x-4=x+a
2 * 10 - 4 = 10 + a
a = 16 - 10
a = 6
c)
3-4x=a-5
3 - 4 * 10 = a - 5
3 - 40 + 5 = a
a = -32
d)
2(x+1)+x=a
2 (10 + 1) + 10 = a
a = 22 + 10
a = 32