first, find the least common denominator (LCD) of 7 and 8,, LCD is 56:
x/7 + x/8 = 8/7 *multiply both sides by 56*
(x/7)(56) + (x/8)(56) = (8/7)(56)
8x + 7x = 64 *combine similar terms*
15x = 64
x = 64/15
so there,, =)
x/7+x/8=8/7
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