book Maths Puzzle Numerical Ability

Please help me to do this equation 15-4x=42-7x

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book Other Question

if 1 more than a certain numver is 3 less than a second number ,the larger of these numbers minus the smaller is equal to
a0
b1
c2
d3
e4 The sun of two numbers is 64. Twice the lesser number is five more that the greater number. Find the numbers.