exam Maths Puzzle Numerical Ability

Translate to an algebra statement; do not solve:

Seven times the difference of six and twice a number yields the same result as the same number decreased by one.

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exam Other Question

Please help me solve this problem:
Simplify by removing factors of 1
4x-4/4x
A concrete driveway measures 18 yards by 4 yards. The driveway will be 0.5 yards thick. (a) How many cubic yards of concrete will be needed? (b) How much will it cost if concrete is $3.50 per cubic yard?